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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 Pentagonal cupola ： ウィキペディア英語版 Pentagonal cupola In geometry, the pentagonal cupola is one of the Johnson solids (''J''5). It can be obtained as a slice of the rhombicosidodecahedron. The pentagonal cupola consists of 5 equilateral triangles, 5 squares, 1 pentagon, and 1 decagon. ==Formulae== The following formulae for volume, surface area and circumradius can be used if all faces are regular, with edge length ''a'':〔Stephen Wolfram, "(Pentagonal cupola )" from Wolfram Alpha. Retrieved July 21, 2010.〕 $V=\backslash left(\backslash frac\backslash left(5+4\backslash sqrt\backslash right)\backslash right)a^3\backslash approx2.32405...a^3$ $A=\backslash left(\backslash frac\backslash left(20+5\backslash sqrt+\backslash sqrt\backslash right)\backslash right)a^2=\backslash left(\backslash frac\backslash left(20+\backslash sqrt)\}\backslash right)\}\backslash right)\backslash right)a^2\backslash approx16.5797...a^2$ $C=\backslash left(\backslash frac\backslash sqrt\{11+4\backslash sqrt\{5\}\}\backslash right)a\backslash approx2.23295...a$ 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「Pentagonal cupola」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.