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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク circular segment ： ウィキペディア英語版 circular segment In geometry, a circular segment (symbol: ⌓) is a region of a circle which is "cut off" from the rest of the circle by a secant or a chord. More formally, a circular segment is a region of two-dimensional space that is bounded by an arc (of less than 180°) of a circle and by the chord connecting the endpoints of the arc. == Formula == Let R be the radius of the circle, θ is the central angle in radians, α is the central angle in degrees, c the chord length, s the arc length, h the sagitta (height) of the segment, and d the height of the triangular portion. *The radius is $R\; =\; h\; +\; d\; =\; h/2+c^2/8h\; \backslash frac\backslash pi\; R\; =\; R\; =\; \backslash arcsin\backslash left(\backslash frac\}\backslash right)\backslash left(h\; +\; \backslash frac\backslash right)$ *The chord length is $c\; =\; 2R\backslash sin\backslash frac\; =\; R\backslash sqrt$ *The sagitta is $h\; =\; R\backslash left(1-\backslash cos\backslash frac\backslash right)\; =\; R\; -\; \backslash sqrt\}$ *The angle is $\backslash theta\; =\; 2\backslash arctan\backslash frac=\; 2\backslash arccos\backslash frac\; =\; 2\backslash arcsin\backslash frac$ 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「circular segment」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.