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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Equilateral triangle ： ウィキペディア英語版 Equilateral triangle a^2 | angle = 60°}} In geometry, an equilateral triangle is a triangle in which all three sides are equal. In the familiar Euclidean geometry, equilateral triangles are also equiangular; that is, all three internal angles are also congruent to each other and are each 60°. They are regular polygons, and can therefore also be referred to as regular triangles. ==Principal properties== Denoting the common length of the sides of the equilateral triangle as ''a'', we can determine using the Pythagorean theorem that: * The area is $A=\backslash frac\; a^2$ * The perimeter is $p=3a\backslash ,\backslash !$ * The radius of the circumscribed circle is $R\; =\; \backslash frac\}\; a$ or $r=\backslash frac$ * The geometric center of the triangle is the center of the circumscribed and inscribed circles * And the altitude (height) from any side is $h=\backslash frac\; a$. Many of these quantities have simple relationships to the altitude ("h") of each vertex from the opposite side: * The area is $A=\backslash frac$ * The radius of the circle circumscribing the three vertices is $R=\backslash frac$ * The radius of the inscribed circle is $r=\backslash frac$ In an equilateral triangle, the altitudes, the angle bisectors, the perpendicular bisectors and the medians to each side coincide. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Equilateral triangle」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.