翻訳と辞書 Words near each other ・ Tetraclea coulteri ・ Tetraclinis ・ Tetraclonia ・ Tetracmanthes astrocosma ・ Tetracme ・ Tetracobalt dodecacarbonyl ・ Tetracoccus ・ Tetracoccus (bacterium) ・ Tetracoccus (plant) ・ Tetracoccus dioicus ・ Tetracoccus hallii ・ Tetracoccus ilicifolius ・ Tetraconch ・ Tetraconodontinae ・ Tetraconta ・ Tetracontadigon ・ Tetracontagon ・ Tetracontaoctagon ・ Tetracoordinate ・ Tetracosactide ・ Tetracosane ・ Tetractenos ・ Tetractomia ・ Tetractomia majus ・ Tetractys ・ Tetracube ・ Tetracyanoethylene ・ Tetracyanoquinodimethane ・ Tetracyclic ・ Tetracyclic antidepressant 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 Tetracontadigon ： ウィキペディア英語版 Tetracontadigon In geometry, a tetracontadigon (or tetracontakaidigon) is a forty-two-sided polygon, or ''42''-gon. (In Greek, the prefix tetraconta- means 40 and di- means 2.) The sum of any tetracontadigon's interior angles is 7200 degrees. ==Regular tetracontadigon== The ''regular tetracontadigon'' can be constructed as a truncated icosihenagon, t. One interior angle in a regular tetracontadigon is 171°, meaning that one exterior angle would be 8°. The area of a regular tetracontadigon is (with ) :$A\; =\; 10.5t^2\; \backslash cot\; \backslash frac$ and its inradius is :$r\; =\; \backslash fract\; \backslash cot\; \backslash frac$ The circumradius of a regular tetracontadigon is :$R\; =\; \backslash fract\; \backslash csc\; \backslash frac$ Since 42 = 2 × 3 × 7, a regular tetracontadigon 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「Tetracontadigon」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.