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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 Robbins pentagon ： ウィキペディア英語版 Robbins pentagon In geometry, a Robbins pentagon is a cyclic pentagon whose side lengths and area are all rational numbers. ==History== Robbins pentagons were named by after David P. Robbins, who had previously given a formula for the area of a cyclic pentagon as a function of its edge lengths. Buchholz and MacDougall chose this name by analogy with the naming of Heron triangles after Hero of Alexandria, the discoverer of Heron's formula for the area of a triangle as a function of its edge lengths. 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「Robbins pentagon」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.