翻訳と辞書 Words near each other ・ Enne Dam ・ Enne gai ・ Enne Njan Thedunnu ・ Enne Petha Raasa ・ Enne Snehikkoo Enne Maathram ・ Ennea ・ Ennea (gastropod) ・ Enneabatrachus ・ Enneabatracus ・ Enneacampus ・ Enneacampus ansorgii ・ Enneacampus kaupi ・ Enneacanthus ・ Enneacanthus chaetodon ・ Enneacanthus gloriosus ・ Enneacontagon ・ Enneacontahexagon ・ Ennead ・ Ennead Architects ・ Enneadecagon ・ Enneadecahedron ・ Enneads ・ Enneagonal antiprism ・ Enneagonal prism ・ Enneagram ・ Enneagram (geometry) ・ Enneagram of Personality ・ Enneagrammic antiprism ・ Enneagrammic prism ・ Enneahedron 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 Enneacontagon ： ウィキペディア英語版 Enneacontagon In geometry, an enneacontagon or enenecontagon (from Ancient Greek ἑννενήκοντα, ninety〔(Greek Numbers and Numerals (Ancient and Modern) ) by Harry Foundalis〕) is a ninety-sided polygon or 90-gon.〔.〕〔(''The New Elements of Mathematics: Algebra and Geometry ) by Charles Sanders Peirce (1976), p.298〕 The sum of any enneacontagon's interior angles is 15840 degrees. A ''regular enneacontagon'' is represented by Schläfli symbol and can be constructed as a truncated tetracontapentagon, t, which alternates two types of edges. ==Regular enneacontagon properties== One interior angle in a regular enneacontagon is 176°, meaning that one exterior angle would be 4°. The area of a regular enneacontagon is (with ) :$A\; =\; \backslash fract^2\; \backslash cot\; \backslash frac$ and its inradius is :$r\; =\; \backslash fract\; \backslash cot\; \backslash frac$ The circumradius of a regular enneacontagon is :$R\; =\; \backslash fract\; \backslash csc\; \backslash frac$ Since 90 = 2 × 32 × 5, a regular enneacontagon is not constructible using a compass and straightedge,〔(Constructible Polygon )〕 but is constructible if the use of an angle trisector is allowed.〔http://www.math.iastate.edu/thesisarchive/MSM/EekhoffMSMSS07.pdf〕 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「Enneacontagon」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.