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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 Elongated triangular bipyramid ： ウィキペディア英語版 Elongated triangular bipyramid In geometry, the elongated triangular bipyramid (or dipyramid) is one of the Johnson solids (''J''14), convex polyhedra whose faces are regular polygons. As the name suggests, it can be constructed by elongating a triangular bipyramid (''J''12) by inserting a triangular prism between its congruent halves. The nirrosula, an African musical instrument woven out of strips of plant leaves, is made in the form of a series of elongated bipyramids with non-equilateral triangles as the faces of their end caps.〔.〕 ==Formulae== The following formulae for volume and surface area can be used if all faces are regular, with edge length ''a'':〔Stephen Wolfram, "(Elongated triangular dipyramid )" from Wolfram Alpha. Retrieved July 22, 2010.〕 $V=(\backslash frac(2\backslash sqrt+3\backslash sqrt))a^3\backslash approx0.668715...a^3$ $A=(\backslash frac(2+\backslash sqrt))a^2\backslash approx5.59808...a^2$ 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「Elongated triangular bipyramid」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.