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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 perimeter ： ウィキペディア英語版 perimeter A perimeter is a path that surrounds a two-dimensional shape. The word comes from the Greek ''peri'' (around) and ''meter'' (measure). The term may be used either for the path or its length - it can be thought of as the length of the outline of a shape. The perimeter of a circle or ellipse is called its circumference. Calculating the perimeter has considerable practical applications. The perimeter can be used to calculate the length of fence required to surround a yard or garden. The perimeter of a wheel (its circumference) describes how far it will roll in one revolution. Similarly, the amount of string wound around a spool is related to the spool's perimeter. == Formulas == \right) || where $n$ is the number of sides and $b$ is the distance between center of the polygon and one of the vertices of the polygon. |- | general polygon || $a\_1\; +\; a\_2\; +\; a\_3\; +\; \backslash cdots\; +\; a\_n\; =\; \backslash sum\_^n\; a\_i$ || where $a\_$ is the length of the $i$-th (1st, 2nd, 3rd ... ''n''th) side of an ''n''-sided polygon. |} The perimeter is the distance around a shape. Perimeters for more general shapes can be calculated as any path with $\backslash int\_0^L\; \backslash mathrms$ where $L$ is the length of the path and $ds$ is an infinitesimal line element. Both of these must be replaced with other algebraic forms in order to be solved: an advanced notion of perimeter, which includes hypersurfaces bounding volumes in $n$-dimensional Euclidean spaces can be found in the theory of Caccioppoli sets. 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「perimeter」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.