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is commonly described as 1/90 of a right angle, or 1/360 of a full rotation. If a full rotation is a basic notion, then the right angle would be more clearly derived from it than from a degree. It should be possibly noted also, what axiom states the full turn meaning, and the property 'all full turns
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In
Germany, as to my knowledge, the circle with dot notation is actually the only one that is used, at least in school education. I only got to know the square notation when reading English publications in university (I am German myself). While I do not have any particular "authoritative source" for
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First, it is not improper to define a right angle as 90°; a quick search finds many reputable sources that do just that. It is also what many other language WP pages have used. Second, even if there is a chicken-and-egg problem re whether 90° can be used as a strict definition, it is entirely
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uncontroversial that an equivalency exists. Stating the 90° equivalency early on in the article is very helpful to many readers who are familiar with the language-agnostic measure "90°" but not with the
English term "right angle".
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Do Web pages count as a source? Try searching for "kąt prosty" or "trójkąt prostokątny" ('right angle' and 'right triangle', respectively, in Polish) in graphics. You can find, for example:
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A Polish colleague of mine uses the circle with dot notation, but I have not found any non-polish people who use it. Anyone found an authoritative source for this symbol?
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on
Knowledge. If you would like to participate, please visit the project page, where you can join
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Please check the order of definition. Defining the right angle as 90° seems improper to me, as a
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Saving some speedy-reverted content. Maybe could be reworked/reintroduced into the article.
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are equal' so that we can derive 'all their quarters (ie. right angles) are equal'. --
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this symbol, any German elementary geometry school book should suffice. --
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My
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594:Knowledge level-4 vital articles in Mathematics
543:They all use the symbol. However, none of them
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275:This article is within the scope of
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417:Saving some speedy-reverted content
218:It is of interest to the following
23:for discussing improvements to the
609:High-priority mathematics articles
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476:Acute, right and obtuse angle
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289:and see a list of open tasks.
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482:Right triangle circumference
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50:New to Knowledge? Welcome!
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