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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 Space diagonal ： ウィキペディア英語版 Space diagonal In geometry a space diagonal (or interior diagonal or body diagonal) of a polyhedron is a line connecting two vertices that are not on the same face. Space diagonals contrast with face diagonals, which connect vertices on the same face (but not on the same edge) as each other.〔William F. Kern, James R Bland,''Solid Mensuration with proofs'', 1938, p.116〕 == Axial diagonal== An axial diagonal is a space diagonal that passes through the center of a polyhedron. For example, in a cube with edge length ''a'', all four space diagonals are axial diagonals, of common length $a\backslash sqrt\; .$ More generally, a cuboid with edge lengths ''a'', ''b'', and ''c'' has all four space diagonals axial, with common length $\backslash sqrt.$ A regular octahedron has 3 axial diagonals, of length $a\backslash sqrt$, with edge length ''a''. A regular icosahedron has 6 axial diagonals of length $a\backslash sqrt$, where ''φ'' is the golden ratio $(1+\backslash sqrt\; 5)/2$.〔.〕 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「Space diagonal」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.