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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 Disk (geometry) ： ウィキペディア英語版 Disk (mathematics) In geometry, a disk (also spelled disc)〔.〕 is the region in a plane bounded by a circle. A disk is said to be ''closed'' or ''open'' according to whether it contains the circle that constitutes its boundary.〔.〕 ==Formulas== In Cartesian coordinates, the open disk of center $(a,\; b)$ and radius ''R'' is given by the formula〔 :$D=\backslash$ while the closed disk of the same center and radius is given by :$\backslash overline=\backslash .$ The area of a closed or open disk of radius ''R'' is π''R''2 (see area of a disk).〔.〕 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「Disk (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.