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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 Trirectangular tetrahedron ： ウィキペディア英語版 Trirectangular tetrahedron In geometry, a trirectangular tetrahedron is a tetrahedron where all three face angles at one vertex are right angles. That vertex is called the ''right angle'' of the trirectangular tetrahedron and the face opposite it is called the ''base''. The three edges that meet at the right angle are called the ''legs'' and the perpendicular from the right angle to the base is called the ''altitude'' of the tetrahedron. ==Metric formulas== If the legs have lengths ''a, b, c'', then the trirectangular tetrahedron has the volume :$V=\backslash frac.$ The altitude ''h'' satisfies〔Eves, Howard Whitley, "Great moments in mathematics (before 1650)", ''Mathematical Association of America'', 1983, p. 41.〕 :$\backslash frac=\backslash frac+\backslash frac+\backslash frac.$ The area $T\_0$ of the base is given by〔Gutierrez, Antonio, "Right Triangle Formulas", ()〕 :$T\_0=\backslash frac.$ 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「Trirectangular tetrahedron」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.