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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 triacontagon ： ウィキペディア英語版 triacontagon In geometry, a triacontagon is a thirty-sided polygon or 30-gon. The sum of any triacontagon's interior angles is 5040 degrees. ==Regular triacontagon == The ''regular triacontagon'' is a constructible polygon, by an edge-bisection of a regular pentadecagon, and can also be constructed as a truncated pentadecagon, t. One interior angle in a regular triacontagon is 168°, meaning that one exterior angle would be 12°. The triacontagon is the largest regular polygon whose interior angle is the sum of the interior angles of smaller polygons: 168° is the sum of the interior angles of the equilateral triangle (60°) and the regular pentagon (108°). The area of a regular triacontagon is (with ) :$A\; =\; \backslash frac\; t^2\; \backslash cot\; \backslash frac\; =\; \backslash frac\; t^2\; (\backslash sqrt)\}\}\; =\; \backslash frac\; t^2\; (\backslash sqrt\; +\; 3\backslash sqrt\; +\; \backslash sqrt\backslash sqrt\; t\; \backslash cot\; \backslash frac\; =\; \backslash frac\; t(\backslash sqrt\; +\; 3\backslash sqrt\; +\; \backslash sqrt\backslash sqrt\; t\; \backslash csc\; \backslash frac\; =\; \backslash frac\; t(2\; +\; \backslash sqrt\; +\; \backslash sqrt\{15+6\backslash sqrt\{5\}\})$ 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「triacontagon」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.