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Star polygon

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points regularly spaced in a circular placement. For instance, in a regular pentagon, a five-pointed star can be obtained by drawing a line from the 1st to the 3rd vertex, from the 3rd to the 5th vertex, from the 5th to the 2nd vertex, from the 2nd to the 4th vertex, and from the 4th to the 1st
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are not coprime, a degenerate polygon will result with coinciding vertices and edges. For example, {6/2} will appear as a triangle, but can be labeled with two sets of vertices: 1-3 and 4-6. This should be seen not as two overlapping triangles, but as a double-winding single unicursal hexagon.
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Wherever a line segment may be drawn between two sides, the region in which the line segment lies is treated as inside the figure. This is shown in the right hand illustration and commonly occurs when making a physical
585:/2, the lines will be parallel, with both resulting in no further intersection in Euclidean space. However, it may be possible to construct some such polygons in spherical space, similarly to the 1351:. The exterior is given a density of 0, and any region of density > 0 is treated as internal. This is shown in the central illustration and commonly occurs in the mathematical treatment of 1355:. (However, for non-orientable polyhedra, density can only be considered modulo 2 and hence, in those cases, for consistency, the first treatment is sometimes used instead.) 451:-sided simple polygon to another vertex, non-adjacent to the first one, and continuing the process until the original vertex is reached again. Alternatively, for integers 1097:
includes nonperiodic tilings, like that with three regular pentagons and one regular star pentagon fitting around certain vertices, 5.5.5.5/2, and related to modern
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Where a line segment occurs, one side is treated as outside and the other as inside. This is shown in the left hand illustration and commonly occurs in computer
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Branko Grunbaum and Geoffrey C. Shephard, Tilings by Regular Polygons, Mathematics Magazine #50 (1977), pp. 227–247, and #51 (1978), pp. 205–206
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The Lighter Side of Mathematics: Proceedings of the Eugène Strens Memorial Conference on Recreational Mathematics and its History
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polygon. Constructions based on stellation also allow regular polygonal compounds to be obtained in cases where the density
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These polygons are often seen in tiling patterns. The parametric angle 𝛼 (in degrees or radians) can be chosen to match
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The interior of a star polygon may be treated in different ways. Three such treatments are illustrated for a pentagram.
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have been studied in depth; while star polygons in general appear not to have been formally defined,
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two, because each side arises once from an original side and once from an original vertex. Since
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When the area of the polygon is calculated, each of these approaches yields a different result.
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Regular convex and star polygons with 3 to 12 vertices, labeled with their Schläfli symbols
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of vertices are not coprime. When constructing star polygons from stellation, however, if
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The number of times that the polygonal curve winds around a given region determines its
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Star polygons feature prominently in art and culture. Such polygons may or may not be
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Uniform tiling § Uniform tilings using star polygons as concave alternating faces
507:; the analogous construction from a retrograde "crossed pentagram" {5/3} results in a 332: 2508: 2448: 2299: 2192: 2112: 2054: 1570: 1486: 541: 2478: 2304: 2268: 2258: 2253: 1590: 192: 90: 233:, but synonyms using other prefixes exist. For example, a nine-pointed polygon or 1717: 2387: 2294: 2273: 2263: 1585: 1504: 1440: 1382: 1055: 1012: 2392: 2248: 2238: 2122: 1565: 554: 388: 2367: 2357: 2334: 2324: 2314: 2243: 2152: 2117: 1722: 1467: 1456: 1448: 1352: 986: 972: 553:
Alternatively, a regular star polygon can also be obtained as a sequence of
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can arise through truncation operations on regular simple or star polygons.
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of neighboring polygons in a tessellation pattern. In his 1619 work
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When the intersecting line segments are removed from a regular star
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Proc of NATO-ASI Conference on Polytopes ... etc. (Toronto, 1993)
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Grünbaum & Shephard (1987). Tilings and Patterns. Section 2.5
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and Geoffrey Shephard consider two of them, as regular star
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that do not generate new vertices, and the other one to the
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degrees, necessarily, and the inner (new) vertices have an
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Regular star polygons were first studied systematically by
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Coxeter, The Densities of the Regular Polytopes I, p. 43:
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the density of a polygon is never altered by truncation.
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Examples of isogonal tilings with isotoxal simple stars
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Coxeter, Introduction to Geometry, second edition, 2.8
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Regular star polygons can be created by connecting one
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is a self-intersecting, equilateral, and equiangular
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identified two primary usages of this terminology by
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formed from a prograde pentagram {5/2} results in a
2401: 2347: 2287: 2231: 2170: 2161: 2053: 2005: 621:-gon, alternating vertices at two different radii. 515:, which can be seen as a "crossed triangle" {3/2} 272:reflects the resemblance of these shapes to the 1978: 1556:List of regular polytopes and compounds#Stars 8: 1905:, New York: W. H. Freeman & Co. (1987), 1738:Are Your Polyhedra the Same as My Polyhedra? 1201: 1154: 286:Regular polygon § Regular star polygons 2167: 1985: 1971: 1963: 1103: 768:Examples of isotoxal star simple polygons 1822: 1820: 1423:Learn how and when to remove this message 992: 922: 771: 351:A regular star polygon is denoted by its 1933:, Heidi Burgiel, Chaim Goodman-Strauss, 1682:Coxeter, Harold Scott Macdonald (1973). 1639:Abelson, Harold, diSessa, Andera, 1980, 766: 331: 1620: 1688:. Courier Dover Publications. p.  1655:, Henry George Liddell, Robert Scott, 487:} will result in the same polygon as { 391:of all the vertices, divided by 360°. 1485:) is a frequent geometrical motif in 1317:-gons and as isotoxal concave simple 156:, but also compound figures like the 7: 1927:, Kluwer Academic (1994), pp. 43–70. 1405:adding citations to reliable sources 1543:with circle and dots (star figure) 1466:The {7/2} and {7/3} star polygons ( 1503:An eleven pointed star called the 439:Construction via vertex connection 379:(they share no factors) and where 229:). The prefix is normally a Greek 223:(in this case generating the word 14: 1838:Tiling with Regular Star Polygons 1534: 1518: 1381: 1373:Star polygons in art and culture 1327: 1194: 1187: 1180: 1173: 1166: 1159: 1060: 1047: 1038: 1029: 1020: 1011: 985: 978: 971: 964: 957: 950: 943: 936: 540: 523:Degenerate regular star polygons 315: 304: 293: 84: 73: 41: 32: 1919:; Polyhedra with Hollow Faces, 1392:needs additional citations for 509:pentagrammic crossed-antiprism 479:/2, then the construction of { 1: 1790:} consists of two coincident 1439:, but they are always highly 1109: 993: 923: 597:Isotoxal star simple polygons 367:(the number of vertices) and 203:Star polygon names combine a 1782:is even, the truncation of { 1509:tomb of Shah Nematollah Vali 1334:These three treatments are: 688:|, the outer internal angle 268:), meaning a line. The name 80:Small stellated dodecahedron 71: 30: 27:Two types of star pentagons 1762:is odd, the truncation of { 651:|, or more generally with { 549:Construction via stellation 128:, one corresponding to the 2536: 1853:Islamic Geometric Patterns 1850:Broug, Eric (2008-05-27). 1516: 1370: 1093:, among periodic tilings, 1076: 283: 152:include polygons like the 18: 16:Regular non-convex polygon 1953:Metamorphoses of polygons 1600:Kepler–Poinsot polyhedron 1528:constructed in a regular 1447:The {5/2} star pentagon ( 1135: 1037: 1019: 878: 872: 511:. Another example is the 51: 1935:The Symmetries of Things 1481:The {8/3} star polygon ( 19:Not to be confused with 1657:A Greek-English Lexicon 1604:uniform star polyhedron 1581:Regular star 4-polytope 1496:; the first is on the 505:pentagrammic antiprism 337: 171:, is a polygon having 1923:, ed. T. Bisztriczky 1576:Pentagramma mirificum 1077:Further information: 713:degrees, necessarily. 335: 284:Further information: 130:regular star polygons 112:Regular star polygons 2218:Nonagon/Enneagon (9) 2148:Tangential trapezoid 1903:Tilings and Patterns 1901:and G. C. Shephard; 1498:emblem of Azerbaijan 1443:. Examples include: 1401:improve this article 756:necessarily (here, { 658:}, which denotes an 628:Tilings and patterns 557:of a convex regular 342:regular star polygon 280:Regular star polygon 258:suffix derives from 163:One definition of a 116:certain notable ones 2330:Megagon (1,000,000) 2098:Isosceles trapezoid 1106: 1073:Examples in tilings 769: 513:tetrahemihexahedron 239:is also known as a 28: 21:Star-shaped polygon 2300:Icositetragon (24) 1879:, CUP, Hbk. 1997, 1743:2016-08-03 at the 1715:Weisstein, Eric W. 1643:, MIT Press, p. 24 1367:In art and culture 1118:"Triangular" stars 1104: 767: 740:𝛼 < 180(1 − 2/ 429:Thomas Bradwardine 338: 274:diffraction spikes 134:intersecting edges 26: 2502: 2501: 2343: 2342: 2320:Myriagon (10,000) 2305:Triacontagon (30) 2269:Heptadecagon (17) 2259:Pentadecagon (15) 2254:Tetradecagon (14) 2193:Quadrilateral (4) 2063:Antiparallelogram 1943:978-1-56881-220-5 1863:978-0-500-28721-7 1770:} is naturally {2 1747:, Branko Grünbaum 1699:978-0-486-61480-9 1685:Regular polytopes 1561:Five-pointed star 1547: 1546: 1433: 1432: 1425: 1302: 1301: 1298:not edge-to-edge 1145:"Octagonal" stars 1136:"Hexagonal" stars 1070: 1069: 660:isotoxal concave 420:, independent of 387:: the sum of the 330: 329: 106:is a type of non- 96: 95: 2527: 2315:Chiliagon (1000) 2295:Icositrigon (23) 2274:Octadecagon (18) 2264:Hexadecagon (16) 2168: 1987: 1980: 1973: 1964: 1868: 1867: 1847: 1841: 1835: 1829: 1824: 1815: 1813: 1801: 1754: 1748: 1735: 1729: 1728: 1727: 1710: 1704: 1703: 1679: 1673: 1666: 1660: 1650: 1644: 1637: 1631: 1628: 1538: 1522: 1515: 1507:was used on the 1428: 1421: 1417: 1414: 1408: 1385: 1377: 1331: 1294: 1293: 1283: 1282: 1274: 1273: 1263: 1262: 1254: 1253: 1243: 1242: 1234: 1233: 1223: 1222: 1214: 1213: 1198: 1191: 1184: 1177: 1170: 1163: 1156:Image of tiling 1107: 1090:Harmonices Mundi 1064: 1051: 1042: 1033: 1024: 1015: 989: 982: 975: 968: 961: 954: 947: 940: 770: 755: 745: 712: 699: 672:-gon with outer 544: 463:th point out of 377:relatively prime 319: 308: 297: 290: 88: 77: 47:|5/2| 45: 36: 29: 2535: 2534: 2530: 2529: 2528: 2526: 2525: 2524: 2505: 2504: 2503: 2498: 2397: 2351: 2339: 2283: 2249:Tridecagon (13) 2239:Hendecagon (11) 2227: 2163: 2157: 2128:Right trapezoid 2049: 2001: 1991: 1955:, published in 1949:Branko Grünbaum 1872: 1871: 1864: 1849: 1848: 1844: 1836: 1832: 1825: 1818: 1803: 1791: 1757: 1755: 1751: 1745:Wayback Machine 1736: 1732: 1713: 1712: 1711: 1707: 1700: 1681: 1680: 1676: 1667: 1663: 1651: 1647: 1641:Turtle Geometry 1638: 1634: 1629: 1622: 1617: 1596:Star polyhedron 1552: 1541:Seal of Solomon 1539: 1523: 1429: 1418: 1412: 1409: 1398: 1386: 1375: 1369: 1340:vector graphics 1311:Branko Grünbaum 1307: 1292: 1289: 1288: 1287: 1281: 1278: 1277: 1276: 1272: 1269: 1268: 1267: 1261: 1258: 1257: 1256: 1252: 1249: 1248: 1247: 1241: 1238: 1237: 1236: 1232: 1229: 1228: 1227: 1221: 1218: 1217: 1216: 1212: 1209: 1208: 1207: 1203:Vertex config. 1146: 1137: 1128: 1119: 1115:-pointed stars 1111: 1110:Isotoxal simple 1099:Penrose tilings 1095:Johannes Kepler 1085:internal angles 1081: 1075: 1065: 1054: 1052: 1043: 1034: 1025: 1016: 999: 997: 995: 932: 927: 925: 895: 861: 857: 852: 848: 847:|6/2| 843: 839: 838:|8/3| 834: 830: 825: 821: 820:|5/2| 816: 812: 807: 803: 798: 794: 793:|9/4| 789: 782: 762: 753: 747: 739: 729: 722: 710: 704: 689: 657: 623:Branko Grünbaum 599: 551: 525: 441: 433:Johannes Kepler 415: 353:Schläfli symbol 320: 309: 298: 288: 282: 276:of real stars. 201: 169:turtle graphics 144:simple polygons 126:Johannes Kepler 122:Branko Grünbaum 89: 78: 66:uniform tilings 52:A regular star 46: 37: 24: 17: 12: 11: 5: 2533: 2531: 2523: 2522: 2517: 2507: 2506: 2500: 2499: 2497: 2496: 2491: 2486: 2481: 2476: 2471: 2466: 2461: 2456: 2454:Pseudotriangle 2451: 2446: 2441: 2436: 2431: 2426: 2421: 2416: 2411: 2405: 2403: 2399: 2398: 2396: 2395: 2390: 2385: 2380: 2375: 2370: 2365: 2360: 2354: 2352: 2345: 2344: 2341: 2340: 2338: 2337: 2332: 2327: 2322: 2317: 2312: 2307: 2302: 2297: 2291: 2289: 2285: 2284: 2282: 2281: 2276: 2271: 2266: 2261: 2256: 2251: 2246: 2244:Dodecagon (12) 2241: 2235: 2233: 2229: 2228: 2226: 2225: 2220: 2215: 2210: 2205: 2200: 2195: 2190: 2185: 2180: 2174: 2172: 2165: 2159: 2158: 2156: 2155: 2150: 2145: 2140: 2135: 2130: 2125: 2120: 2115: 2110: 2105: 2100: 2095: 2090: 2085: 2080: 2075: 2070: 2065: 2059: 2057: 2055:Quadrilaterals 2051: 2050: 2048: 2047: 2042: 2037: 2032: 2027: 2022: 2017: 2011: 2009: 2003: 2002: 1992: 1990: 1989: 1982: 1975: 1967: 1961: 1960: 1946: 1931:John H. Conway 1928: 1914: 1896: 1875:Cromwell, P.; 1870: 1869: 1862: 1842: 1840:, Joseph Myers 1830: 1816: 1749: 1730: 1718:"Star Polygon" 1705: 1698: 1674: 1661: 1645: 1632: 1619: 1618: 1616: 1613: 1612: 1611: 1606: 1593: 1588: 1583: 1578: 1573: 1568: 1563: 1558: 1551: 1548: 1545: 1544: 1532: 1513: 1512: 1501: 1479: 1464: 1459:cults to have 1431: 1430: 1389: 1387: 1380: 1371:Main article: 1368: 1365: 1361: 1360: 1356: 1343: 1306: 1303: 1300: 1299: 1296: 1290: 1284: 1279: 1270: 1264: 1259: 1250: 1244: 1239: 1230: 1224: 1219: 1210: 1204: 1200: 1199: 1192: 1185: 1178: 1171: 1164: 1157: 1153: 1152: 1143: 1134: 1127:"Square" stars 1125: 1116: 1074: 1071: 1068: 1067: 1058: 1045: 1036: 1027: 1018: 1009: 991: 990: 983: 976: 969: 962: 955: 948: 941: 934: 921: 920: 917: 914: 911: 908: 905: 902: 899: 896: 893: 887: 886: 883: 880: 877: 874: 871: 868: 864: 863: 859: 854: 850: 845: 841: 836: 832: 827: 823: 818: 814: 809: 805: 800: 796: 791: 787: 765: 764: 763:} is concave). 760: 751: 727: 720: 714: 708: 702:external angle 690:𝛼 = 180(1 − 2 674:internal angle 655: 598: 595: 550: 547: 546: 545: 524: 521: 440: 437: 411: 408:dihedral group 396:symmetry group 385:turning number 328: 327: 324: 313: 302: 281: 278: 205:numeral prefix 200: 197: 185:turning number 183:is called the 108:convex polygon 94: 93: 82: 70: 69: 62:star polyhedra 49: 48: 39: 15: 13: 10: 9: 6: 4: 3: 2: 2532: 2521: 2520:Star polygons 2518: 2516: 2513: 2512: 2510: 2495: 2494:Weakly simple 2492: 2490: 2487: 2485: 2482: 2480: 2477: 2475: 2472: 2470: 2467: 2465: 2462: 2460: 2457: 2455: 2452: 2450: 2447: 2445: 2442: 2440: 2437: 2435: 2434:Infinite skew 2432: 2430: 2427: 2425: 2422: 2420: 2417: 2415: 2412: 2410: 2407: 2406: 2404: 2400: 2394: 2391: 2389: 2386: 2384: 2381: 2379: 2376: 2374: 2371: 2369: 2366: 2364: 2361: 2359: 2356: 2355: 2353: 2350: 2349:Star polygons 2346: 2336: 2335:Apeirogon (∞) 2333: 2331: 2328: 2326: 2323: 2321: 2318: 2316: 2313: 2311: 2308: 2306: 2303: 2301: 2298: 2296: 2293: 2292: 2290: 2286: 2280: 2279:Icosagon (20) 2277: 2275: 2272: 2270: 2267: 2265: 2262: 2260: 2257: 2255: 2252: 2250: 2247: 2245: 2242: 2240: 2237: 2236: 2234: 2230: 2224: 2221: 2219: 2216: 2214: 2211: 2209: 2206: 2204: 2201: 2199: 2196: 2194: 2191: 2189: 2186: 2184: 2181: 2179: 2176: 2175: 2173: 2169: 2166: 2160: 2154: 2151: 2149: 2146: 2144: 2141: 2139: 2136: 2134: 2131: 2129: 2126: 2124: 2121: 2119: 2116: 2114: 2113:Parallelogram 2111: 2109: 2108:Orthodiagonal 2106: 2104: 2101: 2099: 2096: 2094: 2091: 2089: 2088:Ex-tangential 2086: 2084: 2081: 2079: 2076: 2074: 2071: 2069: 2066: 2064: 2061: 2060: 2058: 2056: 2052: 2046: 2043: 2041: 2038: 2036: 2033: 2031: 2028: 2026: 2023: 2021: 2018: 2016: 2013: 2012: 2010: 2008: 2004: 1999: 1995: 1988: 1983: 1981: 1976: 1974: 1969: 1968: 1965: 1958: 1954: 1950: 1947: 1944: 1940: 1936: 1932: 1929: 1926: 1922: 1918: 1915: 1912: 1911:0-7167-1193-1 1908: 1904: 1900: 1897: 1894: 1893:0-521-66405-5 1890: 1887:. Pbk. 1999, 1886: 1885:0-521-66432-2 1882: 1878: 1874: 1873: 1865: 1859: 1855: 1854: 1846: 1843: 1839: 1834: 1831: 1828: 1823: 1821: 1817: 1811: 1807: 1799: 1795: 1789: 1785: 1781: 1777: 1773: 1769: 1765: 1761: 1753: 1750: 1746: 1742: 1739: 1734: 1731: 1725: 1724: 1719: 1716: 1709: 1706: 1701: 1695: 1691: 1687: 1686: 1678: 1675: 1671: 1670:Star polygons 1665: 1662: 1658: 1654: 1649: 1646: 1642: 1636: 1633: 1627: 1625: 1621: 1614: 1610: 1607: 1605: 1601: 1597: 1594: 1592: 1589: 1587: 1584: 1582: 1579: 1577: 1574: 1572: 1571:Moravian star 1569: 1567: 1564: 1562: 1559: 1557: 1554: 1553: 1549: 1542: 1537: 1533: 1531: 1527: 1521: 1517: 1510: 1506: 1502: 1499: 1495: 1491: 1488: 1484: 1480: 1477: 1473: 1469: 1465: 1463:significance. 1462: 1458: 1454: 1450: 1446: 1445: 1444: 1442: 1438: 1427: 1424: 1416: 1406: 1402: 1396: 1395: 1390:This section 1388: 1384: 1379: 1378: 1374: 1366: 1364: 1357: 1354: 1350: 1349: 1344: 1341: 1337: 1336: 1335: 1332: 1330: 1325: 1323: 1320: 1316: 1312: 1304: 1297: 1285: 1265: 1245: 1225: 1205: 1202: 1197: 1193: 1190: 1186: 1183: 1179: 1176: 1172: 1169: 1165: 1162: 1158: 1155: 1150: 1144: 1141: 1132: 1126: 1123: 1117: 1114: 1108: 1102: 1100: 1096: 1092: 1091: 1086: 1080: 1072: 1063: 1059: 1057: 1050: 1046: 1041: 1032: 1028: 1023: 1014: 1010: 1007: 1003: 988: 984: 981: 977: 974: 970: 967: 963: 960: 956: 953: 949: 946: 942: 939: 935: 930: 918: 915: 912: 909: 906: 903: 900: 897: 892: 889: 888: 884: 881: 875: 869: 866: 865: 855: 846: 837: 828: 819: 810: 801: 792: 786: 780: 776: 772: 759: 750: 743: 737: 733: 726: 719: 715: 707: 703: 697: 693: 687: 683: 679: 678: 677: 675: 671: 668: 664: 663: 654: 650: 646: 642: 638: 634: 630: 629: 624: 620: 617: 614: 611: 608: 604: 596: 594: 592: 588: 584: 580: 576: 572: 568: 564: 560: 556: 548: 543: 539: 538: 537: 534: 530: 522: 520: 518: 514: 510: 506: 502: 498: 494: 490: 486: 482: 478: 474: 469: 466: 462: 458: 454: 450: 447:of a regular 446: 438: 436: 434: 430: 425: 423: 419: 414: 409: 405: 401: 397: 392: 390: 386: 382: 378: 374: 370: 366: 362: 358: 354: 349: 347: 343: 334: 325: 323: 318: 314: 312: 307: 303: 301: 296: 292: 291: 287: 279: 277: 275: 271: 267: 263: 262: 257: 253: 249: 246: 242: 238: 237: 232: 228: 227: 222: 221: 216: 212: 211: 206: 198: 196: 194: 193:spirolaterals 190: 186: 182: 178: 174: 170: 166: 161: 159: 155: 151: 147: 145: 142: 139: 135: 131: 127: 123: 119: 117: 113: 109: 105: 101: 92: 87: 83: 81: 76: 72: 67: 63: 59: 55: 50: 44: 40: 35: 31: 22: 2515:Star symbols 2348: 2288:>20 sides 2223:Decagon (10) 2208:Heptagon (7) 2198:Pentagon (5) 2188:Triangle (3) 2083:Equidiagonal 1956: 1952: 1934: 1924: 1920: 1917:Grünbaum, B. 1902: 1899:Grünbaum, B. 1876: 1852: 1845: 1833: 1809: 1805: 1797: 1793: 1787: 1783: 1779: 1775: 1771: 1767: 1763: 1759: 1752: 1733: 1721: 1708: 1683: 1677: 1669: 1664: 1659:, on Perseus 1656: 1648: 1640: 1635: 1591:Star (glyph) 1494:architecture 1434: 1419: 1410: 1399:Please help 1394:verification 1391: 1362: 1346: 1333: 1326: 1321: 1318: 1314: 1308: 1148: 1139: 1130: 1121: 1112: 1088: 1082: 1005: 1001: 928: 890: 784: 778: 774: 757: 748: 746:degrees and 741: 738:}; however, 735: 731: 724: 717: 705: 695: 691: 685: 681: 669: 666: 661: 652: 648: 644: 640: 636: 626: 618: 615: 602: 600: 582: 578: 574: 570: 566: 562: 558: 552: 532: 528: 526: 496: 492: 488: 484: 480: 476: 472: 470: 464: 460: 456: 452: 448: 442: 431:, and later 426: 421: 417: 416:, of order 2 412: 403: 399: 393: 380: 368: 364: 360: 356: 350: 341: 339: 270:star polygon 269: 265: 259: 255: 247: 243:, using the 240: 234: 224: 218: 208: 202: 180: 172: 165:star polygon 164: 162: 148: 120: 111: 104:star polygon 103: 97: 91:Tessellation 2484:Star-shaped 2459:Rectilinear 2429:Equilateral 2424:Equiangular 2388:Hendecagram 2232:11–20 sides 2213:Octagon (8) 2203:Hexagon (6) 2178:Monogon (1) 2020:Equilateral 1672:, pp. 36–38 1586:Rub el Hizb 1505:hendecagram 1490:Islamic art 1441:symmetrical 1056:Star figure 565:and amount 555:stellations 389:turn angles 213:, with the 191:), like in 2509:Categories 2489:Tangential 2393:Dodecagram 2171:1–10 sides 2162:By number 2143:Tangential 2123:Right kite 1778:}. But if 1615:References 1566:Magic star 1468:heptagrams 1413:March 2024 1342:rendering. 754:< 180°, 207:, such as 167:, used in 2469:Reinhardt 2378:Enneagram 2368:Heptagram 2358:Pentagram 2325:65537-gon 2183:Digon (2) 2153:Trapezoid 2118:Rectangle 2068:Bicentric 2030:Isosceles 2007:Triangles 1877:Polyhedra 1723:MathWorld 1524:An {8/3} 1457:religious 1449:pentagram 1353:polyhedra 1305:Interiors 662:or convex 501:antiprism 406:} is the 363:}, where 236:enneagram 226:pentagram 154:pentagram 150:Polygrams 64:and star 2444:Isotoxal 2439:Isogonal 2383:Decagram 2373:Octagram 2363:Hexagram 2164:of sides 2093:Harmonic 1994:Polygons 1937:, 2008, 1895:. p. 175 1741:Archived 1609:Starfish 1550:See also 1526:octagram 1483:octagram 1472:Kabbalah 998:polygram 931:-pointed 924:Isotoxal 633:polygram 607:isotoxal 468:vertex. 241:nonagram 231:cardinal 158:hexagram 138:isotoxal 100:geometry 54:pentagon 2464:Regular 2409:Concave 2402:Classes 2310:257-gon 2133:Rhombus 2073:Crossed 1800:/2)}'s; 1530:octagon 1474:and in 1453:magical 1437:regular 1348:density 1324:-gons. 1066:{10/3} 1026:{12/5} 996:regular 994:Related 665:simple 610:concave 587:monogon 517:cuploid 373:density 346:polygon 245:ordinal 217:suffix 189:density 141:concave 58:decagon 2474:Simple 2419:Cyclic 2414:Convex 2138:Square 2078:Cyclic 2040:Obtuse 2035:Kepler 1959:(1994) 1941:  1925:et al. 1909:  1891:  1883:  1860:  1808:/2) = 1696:  1653:γραμμή 1602:, and 1487:Mughal 1461:occult 1359:model. 1044:{8/3} 1035:{5/2} 1017:{9/4} 926:simple 856:  829:  811:  802:  781:| 773:| 643:} as | 613:simple 445:vertex 375:) are 266:grammḗ 261:γραμμή 254:. The 210:penta- 38:{5/2} 2449:Magic 2045:Right 2025:Ideal 2015:Acute 1476:Wicca 1286:3.6.6 1151:= 8) 1142:= 6) 1133:= 4) 1124:= 3) 933:star 919:144° 916:120° 910:135° 907:108° 901:150° 716:For { 711:= 180 680:For | 625:, in 591:digon 573:> 371:(the 322:{7/3} 311:{7/2} 300:{5/2} 256:-gram 252:Latin 250:from 220:-gram 215:Greek 199:Names 177:turns 132:with 2479:Skew 2103:Kite 1998:List 1939:ISBN 1907:ISBN 1889:ISBN 1881:ISBN 1858:ISBN 1694:ISBN 1492:and 1455:and 1255:.6.6 1235:.8.4 1215:.3.3 1053:2{3} 913:90° 904:90° 898:60° 885:72° 882:60° 879:45° 876:36° 873:30° 870:20° 676:𝛼. 589:and 559:core 531:and 455:and 398:of { 394:The 326:... 248:nona 175:≥ 2 102:, a 1758:If 1403:by 1295:.6 1291:π/3 1280:π/3 1271:π/3 1266:3.6 1260:π/3 1251:π/3 1246:6.6 1240:π/4 1231:π/4 1226:8.4 1206:3.3 894:ext 867:𝛼 860:72° 851:60° 842:45° 833:45° 824:36° 815:30° 806:30° 797:20° 752:ext 728:ext 709:ext 527:If 471:If 187:or 98:In 2511:: 1951:, 1819:^ 1804:2( 1796:/( 1720:. 1692:. 1690:93 1623:^ 1598:, 1275:.6 1220:𝛼 1211:𝛼 1101:. 1008:} 862:} 858:{5 853:} 849:{6 844:} 840:{8 835:} 831:{4 826:} 822:{5 817:} 813:{6 808:} 804:{3 799:} 795:{9 790:} 788:𝛼 761:𝛼 721:𝛼 656:𝛼 581:= 519:. 495:− 491:/( 475:≥ 435:. 424:. 348:. 340:A 195:. 160:. 146:. 110:. 2000:) 1996:( 1986:e 1979:t 1972:v 1913:. 1866:. 1812:, 1810:q 1806:q 1798:q 1794:p 1792:{ 1788:q 1786:/ 1784:p 1780:q 1776:q 1774:/ 1772:p 1768:q 1766:/ 1764:p 1760:q 1726:. 1702:. 1511:. 1500:. 1478:. 1426:) 1420:( 1415:) 1411:( 1397:. 1322:n 1319:2 1315:n 1149:n 1147:( 1140:n 1138:( 1131:n 1129:( 1122:n 1120:( 1113:n 1006:d 1004:/ 1002:n 1000:{ 929:n 891:β 785:n 783:{ 779:d 777:/ 775:n 758:n 749:β 744:) 742:n 736:d 734:/ 732:n 725:β 718:n 706:β 698:) 696:n 694:/ 692:d 686:d 684:/ 682:n 670:n 667:2 653:n 649:d 647:/ 645:n 641:d 639:/ 637:n 635:{ 619:n 616:2 603:n 583:p 579:q 575:p 571:q 567:p 563:q 533:q 529:p 497:q 493:p 489:p 485:q 483:/ 481:p 477:p 473:q 465:p 461:q 457:q 453:p 449:p 422:q 418:p 413:p 410:D 404:q 402:/ 400:p 381:q 369:q 365:p 361:q 359:/ 357:p 355:{ 264:( 181:q 179:( 173:q 23:.

Index

Star-shaped polygon


pentagon
decagon
star polyhedra
uniform tilings

Small stellated dodecahedron

Tessellation
geometry
convex polygon
certain notable ones
Branko Grünbaum
Johannes Kepler
regular star polygons
intersecting edges
isotoxal
concave
simple polygons
Polygrams
pentagram
hexagram
turtle graphics
turns
turning number
density
spirolaterals
numeral prefix

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