翻訳と辞書 Words near each other ・ Saginaw, Texas ・ Saginomiya Station ・ Saginomiya Station (Shizuoka) ・ Saginomiya Station (Tokyo) ・ Saginuma Station ・ Sagiolechia ・ Sagisag ng Ulirang Kawal ・ Sagisma ・ Sagit Agish ・ Sagit Zaloof Namir ・ Sagitario ・ Sagitcho ・ Sagitta ・ Sagitta (Chinese astronomy) ・ Sagitta (disambiguation) ・ Sagitta (geometry) ・ Sagitta (optics) ・ Sagittal abdominal diameter ・ Sagittal crest ・ Sagittal keel ・ Sagittal plane ・ Sagittal sinus ・ Sagittal sulcus ・ Sagittal suture ・ Sagittala ・ Sagittaria ・ Sagittaria ambigua ・ Sagittaria australis ・ Sagittaria brevirostra ・ Sagittaria cristata 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 Sagitta (geometry) ： ウィキペディア英語版 Sagitta (geometry) In geometry, the sagitta (sometimes abbreviated as sag) of a circular arc is the distance from the center of the arc to the center of its base.〔 It is used extensively in architecture when calculating the arc necessary to span a certain height and distance and also in optics where it is used to find the depth of a spherical mirror or lens. The name comes directly from Latin ''sagitta'', meaning an arrow. ==Formulae== In the following equations, $s$ denotes the sagitta (the depth of the arc), $r$ equals the radius of the circle, and $\backslash ell$ half the length of the chord spanning the base of the arc. The sagitta may be calculated from these quantities as : $s\; =\; r\; -\; \backslash sqrt$. The sagitta may also be calculated from the versine function, for an arc that spans an angle of $\backslash theta$, and coincides with the versine for unit circles: : $s\; =\; r\; \backslash operatorname\backslash frac\; =\; r\backslash left(1-\backslash cos\backslash frac\backslash right)$. Alternatively, the Pythagorean theorem : $r^2\; =\; \backslash ell^2\; +\; (r-s)^2$ may be rearranged to give a formula for the radius as a function of the sagitta and half-chord length: : $r\; =\; \backslash frac\; =\; \backslash frac+\backslash frac$. Also, this can also be rearranged to find the length of the half-chord. : $\backslash ell\; =\; \backslash sqrt$. 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「Sagitta (geometry)」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.