|
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 is the number of sides and is the distance between center of the polygon and one of the vertices of the polygon. |- | general polygon || || where is the length of the -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 where is the length of the path and 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 -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
|