Knowledge

Decagon

Source 📝

3198: 3191: 3184: 2806: 3029: 3022: 3015: 3008: 3001: 2992: 2985: 2978: 2971: 280: 2375: 40: 2363: 312: 269: 260: 3315: 2794: 2824: 3293: 3152: 3282: 3409: 3145: 3304: 3131: 3122: 2964: 3395: 3384: 3138: 3115: 3108: 3434: 3423: 3097: 2783: 2582: 1841: 2121: 1984: 2611: 1695: 2261: 1609: 814: 2465: 1436: 894: 719: 1719: 2827:
Symmetries of a regular decagon. Vertices are colored by their symmetry positions. Blue mirrors are drawn through vertices, and purple mirrors are drawn through edges. Gyration orders are given in the center.
2002: 1863: 2778:{\displaystyle {\frac {\overline {E_{1}E_{10}}}{\overline {E_{1}F}}}={\frac {\overline {E_{10}F}}{\overline {E_{1}E_{10}}}}={\frac {R}{a}}={\frac {1+{\sqrt {5}}}{2}}=\Phi \approx 1.618{\text{.}}} 1334: 1170: 2320: 1481: 1255: 596: 1117: 1076: 404: 929: 530: 1204: 2156: 2878:
These 8 symmetries can be seen in 10 distinct symmetries on the decagon, a larger number because the lines of reflections can either pass through vertices or edges.
627: 473: 1614: 1278: 1032: 969: 949: 550: 493: 444: 424: 356: 336: 1511: 1006: 2180: 1516: 2577:{\displaystyle {\frac {\overline {AM}}{\overline {MH}}}={\frac {\overline {AH}}{\overline {AM}}}={\frac {1+{\sqrt {5}}}{2}}=\Phi \approx 1.618{\text{.}}} 727: 3056:-1)/2 parallelograms. In particular this is true for regular polygons with evenly many sides, in which case the parallelograms are all rhombi. For the 3078: 1357: 4261: 2430:
The five corners of the pentagon constitute alternate corners of the decagon. Join these points to the adjacent new points to form the decagon.
1836:{\displaystyle A={\frac {5}{2}}a^{2}\cot \left({\frac {\pi }{10}}\right)={\frac {5}{2}}a^{2}{\sqrt {5+2{\sqrt {5}}}}\simeq 7.694208843\,a^{2}} 3637: 1341: 819: 632: 2402:
to the opposite side of that same circle. Where each line cuts the circle is a vertex of the decagon.  In other words, 
3591: 2116:{\displaystyle A=5\sin \left({\frac {\pi }{5}}\right)R^{2}={\frac {5}{2}}R^{2}{\sqrt {\frac {5-{\sqrt {5}}}{2}}}\simeq 2.938926261\,R^{2}} 3721: 3532: 3505: 1979:{\displaystyle A=10\tan \left({\frac {\pi }{10}}\right)r^{2}=2r^{2}{\sqrt {5\left(5-2{\sqrt {5}}\right)}}\simeq 3.249196962\,r^{2}} 3197: 120: 110: 92: 4256: 3248:
with equal edge lengths. In 3-dimensions it will be a zig-zag skew decagon and can be seen in the vertices and side edges of a
2423: pentagon,  and the two pentagons have in total the vertices of a concentric 102: 3086:
defines the number of solutions as 62, with 2 orientations for the first symmetric form, and 10 orientations for the other 6.
97: 3257: 3214: 128: 115: 3064:=5, and it can be divided into 10 rhombs, with examples shown below. This decomposition can be seen as 10 of 80 faces in a 3231:
with 10 vertices and edges but not existing on the same plane. The interior of such a decagon is not generally defined. A
2936:
decagon, constructed with equal edge lengths, but vertices alternating two different internal angles. These two forms are
1283: 218: 3190: 1126: 3844: 3824: 84: 3183: 4266: 3819: 3776: 3751: 289: 2902:
when reflection lines path through both edges and vertices. Cyclic symmetries in the middle column are labeled as
2276: 3456: 3879: 2343: 1441: 3804: 3319: 3073: 2374: 2805: 2362: 3829: 3714: 3253: 3210: 2162:
is the distance between parallel sides, or the height when the decagon stands on one side as base, or the
3559:
as the edge length and gives the argument of the cotangent as an angle in degrees rather than in radians.
4230: 4170: 3809: 3629: 3341: 2419: 2339: 1209: 1120: 245: 558: 4251: 4114: 3884: 3814: 3756: 3268: 3249: 3240: 3206: 2267: 359: 3028: 3021: 3014: 3007: 3000: 2991: 2984: 2977: 1081: 1040: 4220: 4195: 4165: 4160: 4119: 3834: 3466: 2970: 2403: 171: 369: 4225: 3766: 2879: 2415: 899: 599: 498: 241: 74: 39: 4205: 3799: 3707: 3676: 3633: 3528: 3501: 3495: 3308: 3245: 2836: 1177: 311: 268: 133: 64: 3548: 2129: 3734: 3593:
Euclid's Plane Geometry, Books III–VI, Practically Applied, or Gradations in Euclid, Part II
3522: 3452: 2407: 2167: 1854: 1690:{\displaystyle A_{\Delta }={\frac {a}{2}}\cdot h={\frac {a^{2}}{4}}{\sqrt {5+2{\sqrt {5}}}}} 293: 2909:
Each subgroup symmetry allows one or more degrees of freedom for irregular forms. Only the
605: 451: 279: 4200: 4180: 4175: 4145: 3864: 3839: 3771: 3460: 3349: 2933: 2925: 2439:
Both in the construction with given circumcircle as well as with given side length is the
2411: 259: 235: 179: 175: 60: 53: 1262: 1011: 3314: 240:
has all sides of equal length and each internal angle will always be equal to 144°. Its
4210: 4190: 4155: 4150: 3781: 3761: 3337: 3065: 2890:. The dihedral symmetries are divided depending on whether they pass through vertices ( 954: 934: 535: 478: 429: 409: 341: 321: 297: 222: 167: 163: 149: 145: 3640:(Chapter 20, Generalized Schaefli symbols, Types of symmetry of a polygon pp. 275-278) 2823: 1486: 974: 4245: 4185: 4036: 3929: 3849: 3791: 3612: 3345: 2914: 2793: 2256:{\displaystyle d=2a\left(\cos {\tfrac {3\pi }{10}}+\cos {\tfrac {\pi }{10}}\right),} 1604:{\displaystyle h={\sqrt {R^{2}-(a/2)^{2}}}={\frac {a}{2}}{\sqrt {5+2{\sqrt {5}}}}\;} 288:
Decagons often appear in tilings with (partial) 5-fold symmetry. The images show an
4215: 4085: 4041: 4005: 3995: 3990: 3470: 3286: 3281: 3228: 2937: 2856: 2601: 2440: 2335: 2331: 2171: 1990: 186: 3303: 3292: 3048:-gon whose opposite sides are parallel and of equal length) can be dissected into 2928:
decagon constructed by five mirrors which can alternate long and short edges, and
2447:
In the construction with given circumcircle the circular arc around G with radius
809:{\displaystyle m\angle PE_{1}E_{10}=180^{\circ }-2\cdot 72^{\circ }=36^{\circ }\;} 3570: 2588:
In the construction with given side length the circular arc around D with radius
4124: 4031: 4010: 4000: 3572:
Geometric Construction of the Regular Decagon and Pentagon Inscribed in a Circle
3427: 3399: 3297: 3271:. The polygons on the perimeter of these projections are regular skew decagons. 3151: 3408: 3144: 2882:
labels these by a letter and group order. Full symmetry of the regular form is
1431:{\displaystyle \;R={\frac {2a}{{\sqrt {5}}-1}}={\frac {a}{2}}({\sqrt {5}}+1)\;} 4129: 3985: 3975: 3859: 3413: 3130: 3679: 4104: 4094: 4071: 4061: 4051: 3980: 3889: 3854: 3684: 3388: 2347: 3121: 2963: 3693: 3394: 3383: 3137: 3114: 4109: 4099: 4056: 4015: 3944: 3934: 3924: 3743: 3614:
RegelmĂ€ĂŸiges Zehneck, → 3. Section "Formeln, Ist die Seite a gegeben ..."
2398:
Extend a line from each vertex of the pentagon through the center of the
2392: 2351: 2163: 248: 198: 17: 3107: 4066: 4046: 3954: 3949: 3939: 3914: 3869: 3730: 3649: 3041: 3037: 2951: 2940:
of each other and have half the symmetry order of the regular decagon.
1847: 889:{\displaystyle \;m\angle ME_{1}P=72^{\circ }-36^{\circ }=36^{\circ }\;} 714:{\displaystyle m\angle E_{1}E_{10}P=m\angle E_{10}PE_{1}=72^{\circ }\;} 214: 3433: 3422: 3096: 3874: 3438: 3101: 3069: 2399: 3919: 3699: 3164: 3652:, Mathematical recreations and Essays, Thirteenth edition, p.141 2391:
Construct a pentagon in a circle by one of the methods shown in
1706: 3703: 251:, t{5}, a quasiregular decagon alternating two types of edges. 3661:
Coxeter, Regular polytopes, 12.4 Petrie polygon, pp. 223-226.
3553:, Society for Promoting Christian Knowledge, 1850, p. 59 3348:: The number of sides in the Petrie polygon is equal to the 310: 3267:
These can also be seen in these four convex polyhedra with
3082: 3205:
A regular skew decagon is seen as zig-zagging edges of a
2843:, order 20. There are 3 subgroup dihedral symmetries: Dih 2441:
golden ratio dividing a line segment by exterior division
1119:
have equal angles of 36° at the vertex, and so they are
3340:
for many higher-dimensional polytopes, shown in these
3235:
has vertices alternating between two parallel planes.
2947: 2913:
subgroup has no degrees of freedom but can be seen as
2234: 2208: 3473:
with the same vertex positions as the regular decagon
2614: 2468: 2279: 2183: 2132: 2005: 1866: 1722: 1617: 1519: 1489: 1444: 1360: 1286: 1265: 1212: 1180: 1129: 1084: 1043: 1014: 977: 957: 937: 902: 822: 730: 635: 608: 561: 538: 501: 481: 454: 432: 412: 372: 344: 324: 318:
The picture shows a regular decagon with side length
3358: 3273: 4138: 4084: 4024: 3968: 3907: 3898: 3790: 3742: 3275:Orthogonal projections of polyhedra on 5-fold axes 2387:An alternative (but similar) method is as follows: 185: 159: 144: 127: 83: 73: 59: 49: 32: 3596:, London: Simpkin, Marshall,& CO., p. 116 2777: 2576: 2314: 2255: 2150: 2115: 1978: 1835: 1689: 1603: 1505: 1475: 1430: 1329:{\displaystyle \;a={\frac {R}{2}}(-1+{\sqrt {5}})} 1328: 1272: 1249: 1198: 1164: 1111: 1070: 1026: 1000: 963: 943: 923: 888: 808: 713: 621: 590: 544: 524: 487: 467: 438: 418: 398: 350: 330: 3072:. A dissection is based on 10 of 30 faces of the 2458:, whose division corresponds to the golden ratio. 1165:{\displaystyle \;{\frac {a}{R}}={\frac {R-a}{a}}} 3550:The elements of plane and spherical trigonometry 3606: 3604: 1339:So the regular decagon can be constructed with 3715: 3585: 3583: 2406:of a regular pentagon under a 8: 3489: 3487: 2920:The highest symmetry irregular decagons are 2315:{\displaystyle d=a{\sqrt {5+2{\sqrt {5}}}}.} 292:(15th century), an illustration in Kepler's 2811:Decagon with a given side length, animation 3904: 3722: 3708: 3700: 2799:Decagon with given circumcircle, animation 1600: 1427: 1361: 1287: 1246: 1213: 1130: 1108: 1067: 931:is also an isosceles triangle with vertex 920: 903: 885: 823: 805: 710: 587: 244:is {10} and can also be constructed as a 3527:, Cambridge University Press, p. 9, 3380: 3278: 3093: 3090:Regular decagon dissected into 10 rhombi 2770: 2745: 2736: 2723: 2707: 2697: 2677: 2669: 2650: 2633: 2623: 2615: 2613: 2569: 2544: 2535: 2502: 2469: 2467: 2300: 2289: 2278: 2233: 2207: 2182: 2131: 2107: 2102: 2082: 2072: 2066: 2052: 2043: 2025: 2004: 1970: 1965: 1945: 1926: 1920: 1904: 1886: 1865: 1827: 1822: 1807: 1796: 1790: 1776: 1759: 1743: 1729: 1721: 1678: 1667: 1656: 1650: 1631: 1622: 1616: 1591: 1580: 1570: 1559: 1547: 1532: 1526: 1518: 1496: 1488: 1472: 1463: 1453: 1448: 1443: 1411: 1398: 1379: 1368: 1359: 1316: 1294: 1285: 1269: 1264: 1231: 1218: 1211: 1179: 1144: 1131: 1128: 1102: 1092: 1083: 1058: 1048: 1042: 1013: 989: 984: 976: 956: 936: 908: 901: 879: 866: 853: 837: 821: 799: 786: 767: 754: 744: 729: 704: 691: 678: 656: 646: 634: 613: 607: 577: 567: 562: 560: 537: 513: 508: 500: 480: 459: 453: 431: 411: 387: 377: 371: 343: 323: 3497:The A to Z of Mathematics: A Basic Guide 3088: 2822: 3483: 2338:, it follows that a regular decagon is 1476:{\displaystyle \Delta \,E_{10}E_{1}M\,} 3694:Definition and properties of a decagon 3500:, John Wiley & Sons, p. 146, 2443:the determining construction element. 406:has two equally long legs with length 29: 1174:Multiplication with the denominators 7: 2600:, whose division corresponds to the 1709:of a regular decagon of side length 3632:, (2008) The Symmetries of Things, 2906:for their central gyration orders. 2761: 2560: 1623: 1445: 1259:This equation for the side length 1250:{\displaystyle \;a^{2}=R^{2}-aR\;} 827: 734: 671: 639: 25: 1206:leads to the quadratic equation: 3432: 3421: 3407: 3393: 3382: 3313: 3302: 3291: 3280: 3196: 3189: 3182: 3166:3 regular skew zig-zag decagons 3150: 3143: 3136: 3129: 3120: 3113: 3106: 3095: 3027: 3020: 3013: 3006: 2999: 2990: 2983: 2976: 2969: 2962: 2804: 2792: 2373: 2361: 591:{\displaystyle {E_{10}E_{1}P}\;} 552:(not designated in the picture). 278: 267: 258: 217:or 10-gon. The total sum of the 118: 113: 108: 100: 95: 90: 38: 4262:Polygons by the number of sides 3628:John H. Conway, Heidi Burgiel, 3575:, The Open Court Publishing Co. 1611:and the triangle has the area: 3494:Sidebotham, Thomas H. (2003), 3258:pentagrammic crossed-antiprism 3215:pentagrammic crossed-antiprism 1556: 1541: 1500: 1490: 1424: 1408: 1323: 1304: 1112:{\displaystyle PE_{10}E_{1}\;} 1071:{\displaystyle E_{10}E_{1}M\;} 995: 978: 519: 502: 1: 3619:. Retrieved 10 February 2016. 3598:. Retrieved 10 February 2016. 3555:. Note that this source uses 3521:Wenninger, Magnus J. (1974), 213:"ten angles") is a ten-sided 3356:, for each symmetry family. 2997: 2960: 2714: 2687: 2660: 2640: 2526: 2513: 2493: 2480: 951:. The length of its legs is 399:{\displaystyle E_{10}E_{1}M} 2886:and no symmetry is labeled 2435:The golden ratio in decagon 1280:has one positive solution: 924:{\displaystyle \;E_{1}MP\;} 525:{\displaystyle ]M\,E_{10}[} 4283: 3696:With interactive animation 2410:with respect of  2126:An alternative formula is 3569:Ludlow, Henry H. (1904), 3457:centered decagonal number 3373: 3367: 3204: 2956: 2898:for perpendiculars), and 290:Islamic geometric pattern 37: 3068:projection plane of the 2894:for diagonal) or edges ( 2380:Construction of pentagon 2344:compass and straightedge 1199:{\displaystyle R,a>0} 1037:The isosceles triangles 3611:Köller, JĂŒrgen (2005), 3320:Rhombic triacontahedron 3264:, symmetry, order 20. 3074:rhombic triacontahedron 2393:constructing a pentagon 2368:Construction of decagon 2151:{\displaystyle A=2.5da} 1438:and the base height of 426:and a base with length 85:Coxeter–Dynkin diagrams 4257:Constructible polygons 3463:modeled on the decagon 3342:orthogonal projections 3254:pentagrammic antiprism 3211:pentagrammic antiprism 2828: 2779: 2578: 2316: 2266:and it can be written 2257: 2152: 2117: 1980: 1837: 1691: 1605: 1507: 1477: 1432: 1330: 1274: 1251: 1200: 1166: 1113: 1072: 1028: 1002: 965: 945: 925: 890: 810: 715: 623: 592: 546: 526: 489: 469: 440: 420: 400: 352: 332: 315: 3630:Chaim Goodman-Strauss 3590:Green, Henry (1861), 2826: 2780: 2592:produces the segment 2579: 2454:produces the segment 2408:point reflection 2317: 2258: 2153: 2118: 1981: 1838: 1692: 1606: 1508: 1478: 1433: 1331: 1275: 1252: 1201: 1167: 1114: 1073: 1029: 1003: 966: 946: 926: 891: 811: 716: 629:and with base angles 624: 622:{\displaystyle E_{1}} 593: 547: 527: 490: 470: 468:{\displaystyle E_{1}} 441: 421: 401: 353: 333: 314: 205:(from the Greek ΎέÎșα 3955:Nonagon/Enneagon (9) 3885:Tangential trapezoid 3334:regular skew decagon 3269:icosahedral symmetry 3250:pentagonal antiprism 3241:regular skew decagon 3233:skew zig-zag decagon 3207:pentagonal antiprism 2957:40 rhomb dissection 2612: 2466: 2425:regular decagon 2277: 2181: 2130: 2003: 1864: 1720: 1615: 1517: 1487: 1483:(i.e. the length of 1442: 1358: 1284: 1263: 1210: 1178: 1127: 1082: 1041: 1012: 975: 955: 935: 900: 820: 728: 633: 606: 559: 536: 499: 479: 452: 430: 410: 370: 360:circumscribed circle 342: 322: 27:Shape with ten sides 4067:Megagon (1,000,000) 3835:Isosceles trapezoid 3276: 3167: 3091: 1349:Further conclusions 1273:{\displaystyle a\,} 1027:{\displaystyle R-a} 971:, so the length of 4037:Icositetragon (24) 3677:Weisstein, Eric W. 3274: 3165: 3089: 3040:states that every 2829: 2775: 2574: 2312: 2253: 2243: 2222: 2148: 2113: 1976: 1833: 1687: 1601: 1503: 1473: 1428: 1326: 1270: 1247: 1196: 1162: 1109: 1068: 1024: 998: 961: 941: 921: 886: 806: 711: 619: 600:isosceles triangle 588: 542: 522: 485: 465: 448:The circle around 436: 416: 396: 348: 328: 316: 225:decagon is 1440°. 4267:Elementary shapes 4239: 4238: 4080: 4079: 4057:Myriagon (10,000) 4042:Triacontagon (30) 4006:Heptadecagon (17) 3996:Pentadecagon (15) 3991:Tetradecagon (14) 3930:Quadrilateral (4) 3800:Antiparallelogram 3638:978-1-56881-220-5 3524:Polyhedron Models 3444: 3443: 3325: 3324: 3309:Icosidodecahedron 3246:vertex-transitive 3221: 3220: 3158: 3157: 3035: 3034: 2773: 2756: 2750: 2731: 2718: 2717: 2690: 2664: 2663: 2643: 2572: 2555: 2549: 2530: 2529: 2516: 2497: 2496: 2483: 2330:As 10 = 2 × 5, a 2307: 2305: 2242: 2221: 2166:of the decagon's 2094: 2093: 2087: 2060: 2033: 1957: 1950: 1894: 1814: 1812: 1784: 1767: 1737: 1685: 1683: 1665: 1639: 1598: 1596: 1578: 1565: 1416: 1406: 1393: 1384: 1342:ruler and compass 1321: 1302: 1160: 1139: 964:{\displaystyle a} 944:{\displaystyle P} 555:Now the triangle 545:{\displaystyle P} 488:{\displaystyle a} 439:{\displaystyle a} 419:{\displaystyle R} 351:{\displaystyle R} 331:{\displaystyle a} 195: 194: 44:A regular decagon 16:(Redirected from 4274: 4052:Chiliagon (1000) 4032:Icositrigon (23) 4011:Octadecagon (18) 4001:Hexadecagon (16) 3905: 3724: 3717: 3710: 3701: 3690: 3689: 3662: 3659: 3653: 3647: 3641: 3626: 3620: 3618: 3608: 3599: 3597: 3587: 3578: 3576: 3566: 3560: 3554: 3545: 3539: 3537: 3518: 3512: 3510: 3491: 3461:figurate numbers 3453:Decagonal number 3436: 3425: 3411: 3397: 3386: 3359: 3317: 3306: 3295: 3284: 3277: 3200: 3193: 3186: 3168: 3154: 3147: 3140: 3133: 3124: 3117: 3110: 3099: 3092: 3085: 3031: 3024: 3017: 3010: 3003: 2994: 2987: 2980: 2973: 2966: 2948: 2808: 2796: 2784: 2782: 2781: 2776: 2774: 2771: 2757: 2752: 2751: 2746: 2737: 2732: 2724: 2719: 2713: 2712: 2711: 2702: 2701: 2691: 2686: 2682: 2681: 2671: 2670: 2665: 2659: 2655: 2654: 2644: 2639: 2638: 2637: 2628: 2627: 2617: 2616: 2599: 2591: 2583: 2581: 2580: 2575: 2573: 2570: 2556: 2551: 2550: 2545: 2536: 2531: 2525: 2517: 2512: 2504: 2503: 2498: 2492: 2484: 2479: 2471: 2470: 2457: 2453: 2377: 2365: 2346:, or by an edge- 2321: 2319: 2318: 2313: 2308: 2306: 2301: 2290: 2262: 2260: 2259: 2254: 2249: 2245: 2244: 2235: 2223: 2217: 2209: 2168:inscribed circle 2157: 2155: 2154: 2149: 2122: 2120: 2119: 2114: 2112: 2111: 2095: 2089: 2088: 2083: 2074: 2073: 2071: 2070: 2061: 2053: 2048: 2047: 2038: 2034: 2026: 1989:In terms of the 1985: 1983: 1982: 1977: 1975: 1974: 1958: 1956: 1952: 1951: 1946: 1927: 1925: 1924: 1909: 1908: 1899: 1895: 1887: 1857:), the area is: 1855:inscribed figure 1846:In terms of the 1842: 1840: 1839: 1834: 1832: 1831: 1815: 1813: 1808: 1797: 1795: 1794: 1785: 1777: 1772: 1768: 1760: 1748: 1747: 1738: 1730: 1696: 1694: 1693: 1688: 1686: 1684: 1679: 1668: 1666: 1661: 1660: 1651: 1640: 1632: 1627: 1626: 1610: 1608: 1607: 1602: 1599: 1597: 1592: 1581: 1579: 1571: 1566: 1564: 1563: 1551: 1537: 1536: 1527: 1512: 1510: 1509: 1506:{\displaystyle } 1504: 1482: 1480: 1479: 1474: 1468: 1467: 1458: 1457: 1437: 1435: 1434: 1429: 1417: 1412: 1407: 1399: 1394: 1392: 1385: 1380: 1377: 1369: 1335: 1333: 1332: 1327: 1322: 1317: 1303: 1295: 1279: 1277: 1276: 1271: 1256: 1254: 1253: 1248: 1236: 1235: 1223: 1222: 1205: 1203: 1202: 1197: 1171: 1169: 1168: 1163: 1161: 1156: 1145: 1140: 1132: 1118: 1116: 1115: 1110: 1107: 1106: 1097: 1096: 1077: 1075: 1074: 1069: 1063: 1062: 1053: 1052: 1033: 1031: 1030: 1025: 1007: 1005: 1004: 1001:{\displaystyle } 999: 994: 993: 970: 968: 967: 962: 950: 948: 947: 942: 930: 928: 927: 922: 913: 912: 895: 893: 892: 887: 884: 883: 871: 870: 858: 857: 842: 841: 815: 813: 812: 807: 804: 803: 791: 790: 772: 771: 759: 758: 749: 748: 720: 718: 717: 712: 709: 708: 696: 695: 683: 682: 661: 660: 651: 650: 628: 626: 625: 620: 618: 617: 597: 595: 594: 589: 586: 582: 581: 572: 571: 551: 549: 548: 543: 531: 529: 528: 523: 518: 517: 494: 492: 491: 486: 474: 472: 471: 466: 464: 463: 445: 443: 442: 437: 425: 423: 422: 417: 405: 403: 402: 397: 392: 391: 382: 381: 357: 355: 354: 349: 337: 335: 334: 329: 294:Harmonices Mundi 282: 271: 262: 123: 122: 121: 117: 116: 112: 111: 105: 104: 103: 99: 98: 94: 93: 42: 30: 21: 4282: 4281: 4277: 4276: 4275: 4273: 4272: 4271: 4242: 4241: 4240: 4235: 4134: 4088: 4076: 4020: 3986:Tridecagon (13) 3976:Hendecagon (11) 3964: 3900: 3894: 3865:Right trapezoid 3786: 3738: 3728: 3675: 3674: 3671: 3666: 3665: 3660: 3656: 3648: 3644: 3627: 3623: 3610: 3609: 3602: 3589: 3588: 3581: 3568: 3567: 3563: 3547: 3546: 3542: 3535: 3520: 3519: 3515: 3508: 3493: 3492: 3485: 3480: 3449: 3437: 3426: 3417: 3412: 3403: 3398: 3387: 3377: 3371: 3365: 3330: 3328:Petrie polygons 3318: 3307: 3296: 3285: 3263: 3260:with the same D 3163: 3100: 3077: 3058:regular decagon 2946: 2874: 2870: 2866: 2862: 2854: 2850: 2846: 2840: 2833:regular decagon 2821: 2816: 2815: 2814: 2813: 2812: 2809: 2801: 2800: 2797: 2738: 2703: 2693: 2692: 2673: 2672: 2646: 2645: 2629: 2619: 2618: 2610: 2609: 2597: 2593: 2589: 2537: 2518: 2505: 2485: 2472: 2464: 2463: 2455: 2452: 2448: 2437: 2412:its center 2385: 2384: 2383: 2382: 2381: 2378: 2370: 2369: 2366: 2328: 2275: 2274: 2210: 2200: 2196: 2179: 2178: 2128: 2127: 2103: 2075: 2062: 2039: 2021: 2001: 2000: 1996:, the area is: 1966: 1935: 1931: 1916: 1900: 1882: 1862: 1861: 1823: 1786: 1755: 1739: 1718: 1717: 1703: 1652: 1618: 1613: 1612: 1555: 1528: 1515: 1514: 1485: 1484: 1459: 1449: 1440: 1439: 1378: 1370: 1356: 1355: 1282: 1281: 1261: 1260: 1227: 1214: 1208: 1207: 1176: 1175: 1146: 1125: 1124: 1098: 1088: 1080: 1079: 1054: 1044: 1039: 1038: 1010: 1009: 985: 973: 972: 953: 952: 933: 932: 904: 898: 897: 875: 862: 849: 833: 818: 817: 795: 782: 763: 750: 740: 726: 725: 700: 687: 674: 652: 642: 631: 630: 609: 604: 603: 573: 563: 557: 556: 534: 533: 509: 497: 496: 477: 476: 455: 450: 449: 428: 427: 408: 407: 383: 373: 368: 367: 340: 339: 320: 319: 309: 304: 303: 302: 301: 285: 284: 283: 274: 273: 272: 264: 263: 242:SchlĂ€fli symbol 231: 229:Regular decagon 219:interior angles 139: 119: 114: 109: 107: 106: 101: 96: 91: 89: 75:SchlĂ€fli symbol 54:Regular polygon 45: 33:Regular decagon 28: 23: 22: 15: 12: 11: 5: 4280: 4278: 4270: 4269: 4264: 4259: 4254: 4244: 4243: 4237: 4236: 4234: 4233: 4228: 4223: 4218: 4213: 4208: 4203: 4198: 4193: 4191:Pseudotriangle 4188: 4183: 4178: 4173: 4168: 4163: 4158: 4153: 4148: 4142: 4140: 4136: 4135: 4133: 4132: 4127: 4122: 4117: 4112: 4107: 4102: 4097: 4091: 4089: 4082: 4081: 4078: 4077: 4075: 4074: 4069: 4064: 4059: 4054: 4049: 4044: 4039: 4034: 4028: 4026: 4022: 4021: 4019: 4018: 4013: 4008: 4003: 3998: 3993: 3988: 3983: 3981:Dodecagon (12) 3978: 3972: 3970: 3966: 3965: 3963: 3962: 3957: 3952: 3947: 3942: 3937: 3932: 3927: 3922: 3917: 3911: 3909: 3902: 3896: 3895: 3893: 3892: 3887: 3882: 3877: 3872: 3867: 3862: 3857: 3852: 3847: 3842: 3837: 3832: 3827: 3822: 3817: 3812: 3807: 3802: 3796: 3794: 3792:Quadrilaterals 3788: 3787: 3785: 3784: 3779: 3774: 3769: 3764: 3759: 3754: 3748: 3746: 3740: 3739: 3729: 3727: 3726: 3719: 3712: 3704: 3698: 3697: 3691: 3670: 3669:External links 3667: 3664: 3663: 3654: 3642: 3621: 3600: 3579: 3561: 3540: 3533: 3513: 3506: 3482: 3481: 3479: 3476: 3475: 3474: 3464: 3448: 3445: 3442: 3441: 3430: 3419: 3415: 3405: 3401: 3391: 3379: 3378: 3375: 3372: 3369: 3366: 3363: 3350:Coxeter number 3346:Coxeter planes 3338:Petrie polygon 3329: 3326: 3323: 3322: 3311: 3300: 3289: 3261: 3219: 3218: 3202: 3201: 3194: 3187: 3179: 3178: 3175: 3172: 3162: 3159: 3156: 3155: 3148: 3141: 3134: 3126: 3125: 3118: 3111: 3104: 3066:Petrie polygon 3033: 3032: 3025: 3018: 3011: 3004: 2996: 2995: 2988: 2981: 2974: 2967: 2959: 2958: 2955: 2945: 2942: 2915:directed edges 2872: 2868: 2864: 2860: 2852: 2848: 2844: 2838: 2820: 2817: 2810: 2803: 2802: 2798: 2791: 2790: 2789: 2788: 2787: 2786: 2785: 2769: 2766: 2763: 2760: 2755: 2749: 2744: 2741: 2735: 2730: 2727: 2722: 2716: 2710: 2706: 2700: 2696: 2689: 2685: 2680: 2676: 2668: 2662: 2658: 2653: 2649: 2642: 2636: 2632: 2626: 2622: 2606: 2605: 2595: 2585: 2584: 2568: 2565: 2562: 2559: 2554: 2548: 2543: 2540: 2534: 2528: 2524: 2521: 2515: 2511: 2508: 2501: 2495: 2491: 2488: 2482: 2478: 2475: 2460: 2459: 2450: 2436: 2433: 2432: 2431: 2428: 2404:the image 2396: 2379: 2372: 2371: 2367: 2360: 2359: 2358: 2357: 2356: 2327: 2324: 2323: 2322: 2311: 2304: 2299: 2296: 2293: 2288: 2285: 2282: 2264: 2263: 2252: 2248: 2241: 2238: 2232: 2229: 2226: 2220: 2216: 2213: 2206: 2203: 2199: 2195: 2192: 2189: 2186: 2147: 2144: 2141: 2138: 2135: 2124: 2123: 2110: 2106: 2101: 2098: 2092: 2086: 2081: 2078: 2069: 2065: 2059: 2056: 2051: 2046: 2042: 2037: 2032: 2029: 2024: 2020: 2017: 2014: 2011: 2008: 1987: 1986: 1973: 1969: 1964: 1961: 1955: 1949: 1944: 1941: 1938: 1934: 1930: 1923: 1919: 1915: 1912: 1907: 1903: 1898: 1893: 1890: 1885: 1881: 1878: 1875: 1872: 1869: 1844: 1843: 1830: 1826: 1821: 1818: 1811: 1806: 1803: 1800: 1793: 1789: 1783: 1780: 1775: 1771: 1766: 1763: 1758: 1754: 1751: 1746: 1742: 1736: 1733: 1728: 1725: 1702: 1699: 1682: 1677: 1674: 1671: 1664: 1659: 1655: 1649: 1646: 1643: 1638: 1635: 1630: 1625: 1621: 1595: 1590: 1587: 1584: 1577: 1574: 1569: 1562: 1558: 1554: 1550: 1546: 1543: 1540: 1535: 1531: 1525: 1522: 1502: 1499: 1495: 1492: 1471: 1466: 1462: 1456: 1452: 1447: 1426: 1423: 1420: 1415: 1410: 1405: 1402: 1397: 1391: 1388: 1383: 1376: 1373: 1367: 1364: 1353: 1352: 1350: 1337: 1336: 1325: 1320: 1315: 1312: 1309: 1306: 1301: 1298: 1293: 1290: 1268: 1257: 1245: 1242: 1239: 1234: 1230: 1226: 1221: 1217: 1195: 1192: 1189: 1186: 1183: 1172: 1159: 1155: 1152: 1149: 1143: 1138: 1135: 1105: 1101: 1095: 1091: 1087: 1066: 1061: 1057: 1051: 1047: 1035: 1023: 1020: 1017: 997: 992: 988: 983: 980: 960: 940: 919: 916: 911: 907: 882: 878: 874: 869: 865: 861: 856: 852: 848: 845: 840: 836: 832: 829: 826: 802: 798: 794: 789: 785: 781: 778: 775: 770: 766: 762: 757: 753: 747: 743: 739: 736: 733: 722: 707: 703: 699: 694: 690: 686: 681: 677: 673: 670: 667: 664: 659: 655: 649: 645: 641: 638: 616: 612: 585: 580: 576: 570: 566: 553: 541: 521: 516: 512: 507: 504: 484: 462: 458: 446: 435: 415: 395: 390: 386: 380: 376: 347: 327: 308: 305: 298:Penrose tiling 287: 286: 277: 276: 275: 266: 265: 257: 256: 255: 254: 253: 230: 227: 193: 192: 189: 183: 182: 161: 157: 156: 153: 146:Internal angle 142: 141: 137: 131: 129:Symmetry group 125: 124: 87: 81: 80: 77: 71: 70: 67: 57: 56: 51: 47: 46: 43: 35: 34: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 4279: 4268: 4265: 4263: 4260: 4258: 4255: 4253: 4250: 4249: 4247: 4232: 4231:Weakly simple 4229: 4227: 4224: 4222: 4219: 4217: 4214: 4212: 4209: 4207: 4204: 4202: 4199: 4197: 4194: 4192: 4189: 4187: 4184: 4182: 4179: 4177: 4174: 4172: 4171:Infinite skew 4169: 4167: 4164: 4162: 4159: 4157: 4154: 4152: 4149: 4147: 4144: 4143: 4141: 4137: 4131: 4128: 4126: 4123: 4121: 4118: 4116: 4113: 4111: 4108: 4106: 4103: 4101: 4098: 4096: 4093: 4092: 4090: 4087: 4086:Star polygons 4083: 4073: 4072:Apeirogon (∞) 4070: 4068: 4065: 4063: 4060: 4058: 4055: 4053: 4050: 4048: 4045: 4043: 4040: 4038: 4035: 4033: 4030: 4029: 4027: 4023: 4017: 4016:Icosagon (20) 4014: 4012: 4009: 4007: 4004: 4002: 3999: 3997: 3994: 3992: 3989: 3987: 3984: 3982: 3979: 3977: 3974: 3973: 3971: 3967: 3961: 3958: 3956: 3953: 3951: 3948: 3946: 3943: 3941: 3938: 3936: 3933: 3931: 3928: 3926: 3923: 3921: 3918: 3916: 3913: 3912: 3910: 3906: 3903: 3897: 3891: 3888: 3886: 3883: 3881: 3878: 3876: 3873: 3871: 3868: 3866: 3863: 3861: 3858: 3856: 3853: 3851: 3850:Parallelogram 3848: 3846: 3845:Orthodiagonal 3843: 3841: 3838: 3836: 3833: 3831: 3828: 3826: 3825:Ex-tangential 3823: 3821: 3818: 3816: 3813: 3811: 3808: 3806: 3803: 3801: 3798: 3797: 3795: 3793: 3789: 3783: 3780: 3778: 3775: 3773: 3770: 3768: 3765: 3763: 3760: 3758: 3755: 3753: 3750: 3749: 3747: 3745: 3741: 3736: 3732: 3725: 3720: 3718: 3713: 3711: 3706: 3705: 3702: 3695: 3692: 3687: 3686: 3681: 3678: 3673: 3672: 3668: 3658: 3655: 3651: 3646: 3643: 3639: 3635: 3631: 3625: 3622: 3616: 3615: 3607: 3605: 3601: 3595: 3594: 3586: 3584: 3580: 3574: 3573: 3565: 3562: 3558: 3552: 3551: 3544: 3541: 3536: 3534:9780521098595 3530: 3526: 3525: 3517: 3514: 3509: 3507:9780471461630 3503: 3499: 3498: 3490: 3488: 3484: 3477: 3472: 3468: 3465: 3462: 3458: 3454: 3451: 3450: 3446: 3440: 3435: 3431: 3429: 3424: 3420: 3418: 3410: 3406: 3404: 3396: 3392: 3390: 3385: 3381: 3361: 3360: 3357: 3355: 3351: 3347: 3343: 3339: 3335: 3327: 3321: 3316: 3312: 3310: 3305: 3301: 3299: 3294: 3290: 3288: 3283: 3279: 3272: 3270: 3265: 3259: 3255: 3251: 3247: 3243: 3242: 3236: 3234: 3230: 3226: 3216: 3212: 3208: 3203: 3199: 3195: 3192: 3188: 3185: 3181: 3180: 3176: 3173: 3170: 3169: 3160: 3153: 3149: 3146: 3142: 3139: 3135: 3132: 3128: 3127: 3123: 3119: 3116: 3112: 3109: 3105: 3103: 3098: 3094: 3087: 3084: 3080: 3075: 3071: 3067: 3063: 3059: 3055: 3051: 3047: 3043: 3039: 3030: 3026: 3023: 3019: 3016: 3012: 3009: 3005: 3002: 2998: 2993: 2989: 2986: 2982: 2979: 2975: 2972: 2968: 2965: 2961: 2953: 2950: 2949: 2943: 2941: 2939: 2935: 2931: 2927: 2923: 2918: 2916: 2912: 2907: 2905: 2901: 2897: 2893: 2889: 2885: 2881: 2876: 2859:symmetries: Z 2858: 2842: 2834: 2825: 2818: 2807: 2795: 2767: 2764: 2758: 2753: 2747: 2742: 2739: 2733: 2728: 2725: 2720: 2708: 2704: 2698: 2694: 2683: 2678: 2674: 2666: 2656: 2651: 2647: 2634: 2630: 2624: 2620: 2608: 2607: 2603: 2587: 2586: 2566: 2563: 2557: 2552: 2546: 2541: 2538: 2532: 2522: 2519: 2509: 2506: 2499: 2489: 2486: 2476: 2473: 2462: 2461: 2446: 2445: 2444: 2442: 2434: 2429: 2426: 2422: 2421: 2417: 2413: 2409: 2405: 2401: 2397: 2394: 2390: 2389: 2388: 2376: 2364: 2355: 2353: 2350:of a regular 2349: 2345: 2341: 2340:constructible 2337: 2333: 2325: 2309: 2302: 2297: 2294: 2291: 2286: 2283: 2280: 2273: 2272: 2271: 2269: 2268:algebraically 2250: 2246: 2239: 2236: 2230: 2227: 2224: 2218: 2214: 2211: 2204: 2201: 2197: 2193: 2190: 2187: 2184: 2177: 2176: 2175: 2173: 2169: 2165: 2161: 2145: 2142: 2139: 2136: 2133: 2108: 2104: 2099: 2096: 2090: 2084: 2079: 2076: 2067: 2063: 2057: 2054: 2049: 2044: 2040: 2035: 2030: 2027: 2022: 2018: 2015: 2012: 2009: 2006: 1999: 1998: 1997: 1995: 1992: 1971: 1967: 1962: 1959: 1953: 1947: 1942: 1939: 1936: 1932: 1928: 1921: 1917: 1913: 1910: 1905: 1901: 1896: 1891: 1888: 1883: 1879: 1876: 1873: 1870: 1867: 1860: 1859: 1858: 1856: 1852: 1849: 1828: 1824: 1819: 1816: 1809: 1804: 1801: 1798: 1791: 1787: 1781: 1778: 1773: 1769: 1764: 1761: 1756: 1752: 1749: 1744: 1740: 1734: 1731: 1726: 1723: 1716: 1715: 1714: 1713:is given by: 1712: 1708: 1700: 1698: 1680: 1675: 1672: 1669: 1662: 1657: 1653: 1647: 1644: 1641: 1636: 1633: 1628: 1619: 1593: 1588: 1585: 1582: 1575: 1572: 1567: 1560: 1552: 1548: 1544: 1538: 1533: 1529: 1523: 1520: 1497: 1493: 1469: 1464: 1460: 1454: 1450: 1421: 1418: 1413: 1403: 1400: 1395: 1389: 1386: 1381: 1374: 1371: 1365: 1362: 1351: 1348: 1347: 1346: 1344: 1343: 1318: 1313: 1310: 1307: 1299: 1296: 1291: 1288: 1266: 1258: 1243: 1240: 1237: 1232: 1228: 1224: 1219: 1215: 1193: 1190: 1187: 1184: 1181: 1173: 1157: 1153: 1150: 1147: 1141: 1136: 1133: 1122: 1103: 1099: 1093: 1089: 1085: 1064: 1059: 1055: 1049: 1045: 1036: 1021: 1018: 1015: 990: 986: 981: 958: 938: 917: 914: 909: 905: 880: 876: 872: 867: 863: 859: 854: 850: 846: 843: 838: 834: 830: 824: 800: 796: 792: 787: 783: 779: 776: 773: 768: 764: 760: 755: 751: 745: 741: 737: 731: 723: 705: 701: 697: 692: 688: 684: 679: 675: 668: 665: 662: 657: 653: 647: 643: 636: 614: 610: 601: 583: 578: 574: 568: 564: 554: 539: 514: 510: 505: 482: 460: 456: 447: 433: 413: 393: 388: 384: 378: 374: 366:The triangle 365: 364: 363: 361: 345: 325: 313: 306: 299: 296:(1619) and a 295: 291: 281: 270: 261: 252: 250: 247: 243: 239: 237: 228: 226: 224: 220: 216: 212: 208: 204: 200: 190: 188: 184: 181: 177: 173: 169: 165: 162: 158: 154: 151: 147: 143: 140:), order 2×10 135: 132: 130: 126: 88: 86: 82: 78: 76: 72: 68: 66: 62: 58: 55: 52: 48: 41: 36: 31: 19: 4025:>20 sides 3960:Decagon (10) 3959: 3945:Heptagon (7) 3935:Pentagon (5) 3925:Triangle (3) 3820:Equidiagonal 3683: 3657: 3645: 3624: 3613: 3592: 3571: 3564: 3556: 3549: 3543: 3523: 3516: 3496: 3471:star polygon 3353: 3333: 3331: 3287:Dodecahedron 3266: 3239: 3237: 3232: 3229:skew polygon 3225:skew decagon 3224: 3222: 3161:Skew decagon 3061: 3057: 3053: 3049: 3045: 3036: 2929: 2921: 2919: 2910: 2908: 2903: 2899: 2895: 2891: 2887: 2883: 2877: 2857:cyclic group 2832: 2830: 2602:golden ratio 2438: 2424: 2418: 2386: 2336:Fermat prime 2332:power of two 2329: 2326:Construction 2265: 2172:trigonometry 2170:. By simple 2159: 2125: 1993: 1991:circumradius 1988: 1850: 1845: 1710: 1704: 1354: 1340: 1338: 602:with vertex 475:with radius 317: 234: 232: 210: 206: 202: 196: 187:Dual polygon 4252:10 (number) 4221:Star-shaped 4196:Rectilinear 4166:Equilateral 4161:Equiangular 4125:Hendecagram 3969:11–20 sides 3950:Octagon (8) 3940:Hexagon (6) 3915:Monogon (1) 3757:Equilateral 3617:(in German) 3428:5-orthoplex 3344:in various 3298:Icosahedron 3076:. The list 2954:projection 2880:John Conway 2100:2.938926261 1963:3.249196962 1820:7.694208843 532:in a point 495:intersects 338:and radius 307:Side length 172:equilateral 4246:Categories 4226:Tangential 4130:Dodecagram 3908:1–10 sides 3899:By number 3880:Tangential 3860:Right kite 3478:References 3177:{5/3}#{ } 3174:{5/2}#{ } 2944:Dissection 2416:concentric 2414:is a 1853:(see also 896:and hence 724:Therefore 209:and ÎłÏ‰ÎœÎŻÎ± 160:Properties 79:{10}, t{5} 4206:Reinhardt 4115:Enneagram 4105:Heptagram 4095:Pentagram 4062:65537-gon 3920:Digon (2) 3890:Trapezoid 3855:Rectangle 3805:Bicentric 3767:Isosceles 3744:Triangles 3685:MathWorld 3680:"Decagon" 3389:9-simplex 2851:, and Dih 2765:≈ 2762:Φ 2715:¯ 2688:¯ 2661:¯ 2641:¯ 2564:≈ 2561:Φ 2527:¯ 2514:¯ 2494:¯ 2481:¯ 2420:congruent 2348:bisection 2237:π 2231:⁡ 2215:π 2205:⁡ 2097:≃ 2080:− 2028:π 2019:⁡ 1960:≃ 1940:− 1889:π 1880:⁡ 1817:≃ 1762:π 1753:⁡ 1642:⋅ 1624:Δ 1539:− 1446:Δ 1387:− 1308:− 1238:− 1151:− 1123:, hence: 1019:− 881:∘ 868:∘ 860:− 855:∘ 828:∠ 801:∘ 788:∘ 780:⋅ 774:− 769:∘ 735:∠ 706:∘ 672:∠ 640:∠ 246:truncated 18:Decagonal 4181:Isotoxal 4176:Isogonal 4120:Decagram 4110:Octagram 4100:Hexagram 3901:of sides 3830:Harmonic 3731:Polygons 3467:Decagram 3447:See also 3213:, and a 3171:{5}#{ } 2934:isotoxal 2926:isogonal 2855:, and 4 2841:symmetry 2819:Symmetry 2352:pentagon 2334:times a 2164:diameter 249:pentagon 199:geometry 180:isotoxal 176:isogonal 134:Dihedral 65:vertices 4201:Regular 4146:Concave 4139:Classes 4047:257-gon 3870:Rhombus 3810:Crossed 3650:Coxeter 3336:is the 3083:A006245 3081::  3042:zonogon 3038:Coxeter 2952:10-cube 2871:, and Z 1848:apothem 1121:similar 358:of the 238:decagon 236:regular 215:polygon 203:decagon 150:degrees 4211:Simple 4156:Cyclic 4151:Convex 3875:Square 3815:Cyclic 3777:Obtuse 3772:Kepler 3636:  3531:  3504:  3439:5-cube 3256:, and 3102:5-cube 3070:5-cube 2400:circle 2342:using 2158:where 598:is an 223:simple 211:gonĂ­a, 168:cyclic 164:Convex 4186:Magic 3782:Right 3762:Ideal 3752:Acute 3227:is a 2938:duals 2932:, an 2924:, an 2847:, Dih 2768:1.618 2567:1.618 1513:) is 816:. So 221:of a 61:Edges 4216:Skew 3840:Kite 3735:List 3634:ISBN 3529:ISBN 3502:ISBN 3469:, a 3455:and 3332:The 3209:, a 3079:OEIS 3044:(a 2 2835:has 2831:The 1707:area 1705:The 1701:Area 1191:> 1078:and 207:dĂ©ka 201:, a 191:Self 155:144° 63:and 50:Type 3244:is 2930:p10 2922:d10 2911:g10 2884:r20 2867:, Z 2863:, Z 2837:Dih 2270:as 2228:cos 2202:cos 2140:2.5 2016:sin 1877:tan 1750:cot 1008:is 765:180 197:In 4248:: 3682:. 3603:^ 3582:^ 3486:^ 3459:, 3416:31 3402:11 3352:, 3262:5d 3252:, 3238:A 3223:A 3217:. 3060:, 2917:. 2888:a1 2875:. 2861:10 2839:10 2709:10 2679:10 2635:10 2596:10 2590:DA 2456:AH 2449:GE 2354:. 2240:10 2219:10 2174:, 1892:10 1874:10 1765:10 1697:. 1455:10 1345:. 1094:10 1050:10 991:10 877:36 864:36 851:72 797:36 784:72 756:10 702:72 680:10 658:10 569:10 515:10 379:10 362:. 233:A 178:, 174:, 170:, 166:, 138:10 136:(D 69:10 3737:) 3733:( 3723:e 3716:t 3709:v 3688:. 3577:. 3557:a 3538:. 3511:. 3414:1 3400:4 3376:5 3374:B 3370:6 3368:D 3364:9 3362:A 3354:h 3062:m 3054:m 3052:( 3050:m 3046:m 2904:g 2900:i 2896:p 2892:d 2873:1 2869:2 2865:5 2853:1 2849:2 2845:5 2772:. 2759:= 2754:2 2748:5 2743:+ 2740:1 2734:= 2729:a 2726:R 2721:= 2705:E 2699:1 2695:E 2684:F 2675:E 2667:= 2657:F 2652:1 2648:E 2631:E 2625:1 2621:E 2604:. 2598:F 2594:E 2571:. 2558:= 2553:2 2547:5 2542:+ 2539:1 2533:= 2523:M 2520:A 2510:H 2507:A 2500:= 2490:H 2487:M 2477:M 2474:A 2451:3 2427:. 2395:. 2310:. 2303:5 2298:2 2295:+ 2292:5 2287:a 2284:= 2281:d 2251:, 2247:) 2225:+ 2212:3 2198:( 2194:a 2191:2 2188:= 2185:d 2160:d 2146:a 2143:d 2137:= 2134:A 2109:2 2105:R 2091:2 2085:5 2077:5 2068:2 2064:R 2058:2 2055:5 2050:= 2045:2 2041:R 2036:) 2031:5 2023:( 2013:5 2010:= 2007:A 1994:R 1972:2 1968:r 1954:) 1948:5 1943:2 1937:5 1933:( 1929:5 1922:2 1918:r 1914:2 1911:= 1906:2 1902:r 1897:) 1884:( 1871:= 1868:A 1851:r 1829:2 1825:a 1810:5 1805:2 1802:+ 1799:5 1792:2 1788:a 1782:2 1779:5 1774:= 1770:) 1757:( 1745:2 1741:a 1735:2 1732:5 1727:= 1724:A 1711:a 1681:5 1676:2 1673:+ 1670:5 1663:4 1658:2 1654:a 1648:= 1645:h 1637:2 1634:a 1629:= 1620:A 1594:5 1589:2 1586:+ 1583:5 1576:2 1573:a 1568:= 1561:2 1557:) 1553:2 1549:/ 1545:a 1542:( 1534:2 1530:R 1524:= 1521:h 1501:] 1498:D 1494:M 1491:[ 1470:M 1465:1 1461:E 1451:E 1425:) 1422:1 1419:+ 1414:5 1409:( 1404:2 1401:a 1396:= 1390:1 1382:5 1375:a 1372:2 1366:= 1363:R 1324:) 1319:5 1314:+ 1311:1 1305:( 1300:2 1297:R 1292:= 1289:a 1267:a 1244:R 1241:a 1233:2 1229:R 1225:= 1220:2 1216:a 1194:0 1188:a 1185:, 1182:R 1158:a 1154:a 1148:R 1142:= 1137:R 1134:a 1104:1 1100:E 1090:E 1086:P 1065:M 1060:1 1056:E 1046:E 1034:. 1022:a 1016:R 996:] 987:E 982:P 979:[ 959:a 939:P 918:P 915:M 910:1 906:E 873:= 847:= 844:P 839:1 835:E 831:M 825:m 793:= 777:2 761:= 752:E 746:1 742:E 738:P 732:m 721:. 698:= 693:1 689:E 685:P 676:E 669:m 666:= 663:P 654:E 648:1 644:E 637:m 615:1 611:E 584:P 579:1 575:E 565:E 540:P 520:[ 511:E 506:M 503:] 483:a 461:1 457:E 434:a 414:R 394:M 389:1 385:E 375:E 346:R 326:a 300:. 152:) 148:( 20:)

Index

Decagonal

Regular polygon
Edges
vertices
SchlÀfli symbol
Coxeter–Dynkin diagrams
Symmetry group
Dihedral
Internal angle
degrees
Convex
cyclic
equilateral
isogonal
isotoxal
Dual polygon
geometry
polygon
interior angles
simple
regular
SchlÀfli symbol
truncated
pentagon



Islamic geometric pattern
Harmonices Mundi

Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.

↑