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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 Parallelogon ： ウィキペディア英語版 Parallelogon A parallelogon is a polygon such that images of the polygon under translations only tile the plane when fitted together along entire sides.〔Aleksandr Danilovich Aleksandrov ''Convex Polyhedra'' (p351 )〕 A parallelogon must have an even number of sides and opposite sides must be equal in length and parallel (hence the name). A less obvious restriction is that a parallelogon can only have four or six sides;〔 a four-sided parallelogon is a parallelogram. In general a parallelogon has 180-degree rotational symmetry around its center. == Two polygonal types == Quadrilateral and hexagonal parallelogons each have varied geometric symmetric forms. In general they all have central inversion symmetry, order 2. Hexagonal parallelogons enable the possibility of nonconvex polygons. 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「Parallelogon」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.