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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 Icosagon ： ウィキペディア英語版 Icosagon In geometry, an icosagon is a twenty-sided polygon or 20-gon. The sum of any icosagon's interior angles is 3240 degrees. ==Regular icosagon== The ''regular icosagon'' has Schläfli symbol , and can also be constructed as a truncated decagon, t, or a twice-truncated pentagon, tt. One interior angle in a regular icosagon is 162°, meaning that one exterior angle would be 18°. The area of a regular icosagon with edge length ''t'' is :$A=t^2(1+\backslash sqrt+\backslash sqrt(\backslash sqrt-1);$ since the area of the circle is $\backslash pi\; R^2,$ the regular icosagon fills approximately 98.36% of its circumcircle. 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「Icosagon」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.