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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 Gyroelongated bipyramid ： ウィキペディア英語版 Gyroelongated bipyramid In geometry, the gyroelongated bipyramids are an infinite set of polyhedra, constructed by elongating an ''n''-gonal bipyramid by inserting an ''n''-gonal antiprism between its congruent halves. ==Forms== Two members of the set can be deltahedra, that is, constructed entirely of equilateral triangles: the gyroelongated square bipyramid, a Johnson solid, and the icosahedron, a Platonic solid. The ''gyroelongated triangular bipyramid'' can be made with equilateral triangles, but is not a deltahedron because it has coplanar faces, i.e. is not strictly convex. With pairs of triangles merged into rhombi, it can be seen as a trigonal trapezohedron. The other members can be constructed with isosceles triangles. 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「Gyroelongated 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.