翻訳と辞書 Words near each other ・ Lambert of Chalon ・ Lambert of Hersfeld ・ Lambert of Italy ・ Lambert of Maastricht ・ Lambert of St-Bertin ・ Lambert of Vence ・ Lambert of Vignory ・ Lambert Orkis ・ Lambert Packard ・ Lambert Park (Leichhardt) ・ Lambert Peter Wigle ・ Lambert Playfair ・ Lambert Point Light ・ Lambert projection ・ Lambert Puppet Theatre ・ Lambert quadrilateral ・ Lambert Redd ・ Lambert Review ・ Lambert River ・ Lambert Road Baptist Church ・ Lambert Roberts ・ Lambert Saravane ・ Lambert Schaus ・ Lambert Schlechter ・ Lambert Schmithausen ・ Lambert series ・ Lambert Simnel ・ Lambert Simnel (horse) ・ Lambert Strether ・ Lambert summation Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Lambert quadrilateral ： ウィキペディア英語版 Lambert quadrilateral In geometry, a Lambert quadrilateral,〔the alternate name Ibn al-Haytham–Lambert quadrilateral, has been suggested in Boris Abramovich Rozenfelʹd (1988), ''A History of Non-Euclidean Geometry: Evolution of the Concept of a Geometric Space'', p. 65. Springer, ISBN 0-387-96458-4, in honor of Ibn al-Haytham〕 named after Johann Heinrich Lambert, is a quadrilateral three of whose angles are right angles. Historically, the fourth angle of a Lambert quadrilateral was of considerable interest since if it could be shown to be a right angle, then the Euclidean parallel postulate could be proved as a theorem. It is now known that the type of the fourth angle depends upon the geometry in which the quadrilateral exists. In hyperbolic geometry the fourth angle is acute, in Euclidean geometry it is a right angle and in elliptic geometry it is an obtuse angle. A Lambert quadrilateral can be constructed from a Saccheri quadrilateral by joining the midpoints of the base and summit of the Saccheri quadrilateral. This line segment is perpendicular to both the base and summit and so either half of the Saccheri quadrilateral is a Lambert quadrilateral. == Examples == 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「Lambert quadrilateral」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.