翻訳と辞書 Words near each other ・ Conchobar mac Tadg ・ Conchobar mac Taidg Mór ・ Conchobar Maenmaige Ua Cellaigh ・ Conchobar Maenmaige Ua Conchobair ・ Conchobar Ua Briain ・ Conchobar Ua Conchobair ・ Conchobar ua nDiarmata ・ Conchobar Ó Cellaigh ・ Conchobar Ó Muirdaig ・ Conchobhar Ua Flaithbheartaigh ・ Conchobhar Ó Coineóil ・ Conchocometa ・ Conchoderma ・ Conchodus ・ Conchoid ・ Conchoid (mathematics) ・ Conchoid of de Sluze ・ Conchoid of Dürer ・ Conchoidal fracture ・ Concholepas ・ Concholepas concholepas ・ Conchological Society of Great Britain & Ireland ・ Conchology ・ Conchomyces ・ Conchopoma ・ Conchoraptor ・ Conchos darter ・ Conchos shiner ・ Conchospiral ・ Conchou 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 Conchoid (mathematics) ： ウィキペディア英語版 Conchoid (mathematics) A conchoid is a curve derived from a fixed point ''O'', another curve, and a length ''d''. ==Description== For every line through ''O'' that intersects the given curve at ''A'' the two points on the line which are ''d'' from ''A'' are on the conchoid. The conchoid is, therefore, the cissoid of the given curve and a circle of radius ''d'' and center ''O''. They are called conchoids because the shape of their outer branches resembles conch shells. The simplest expression uses polar coordinates with ''O'' at the origin. If :$r=\backslash alpha(\backslash theta)$ expresses the given curve, then :$r=\backslash alpha(\backslash theta)\backslash pm\; d$ expresses the conchoid. If the curve is a line, then the conchoid is the ''conchoid of Nicomedes''. For instance, if the curve is the line $x=a$, then the line's polar form is $r=\backslash frac$ and therefore the conchoid can be expressed parametrically as :$x=a\; \backslash pm\; d\; \backslash cos\; \backslash theta,\backslash ,\; y=a\; \backslash tan\; \backslash theta\; \backslash pm\; d\; \backslash sin\; \backslash theta.$ A limaçon is a conchoid with a circle as the given curve. The so-called conchoid of de Sluze and conchoid of Dürer are not actually conchoids. The former is a strict cissoid and the latter a construction more general yet. 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「Conchoid (mathematics)」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.