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・ Perimede catapasta
・ Perimede circitor
・ Perimede citeriella
・ Perimede decimanella
・ Perimede erema
・ Perimede erransella
・ Perimede falcata
・ Perimede grandis
・ Perimede latris
・ Perimede maniola
・ Perimede parilis
・ Perimede purpurascens
・ Perimede ricina
・ Perimedes
・ Perimele
Perimeter
・ Perimeter (disambiguation)
・ Perimeter (video game)
・ Perimeter Aviation
・ Perimeter Bicycling
・ Perimeter Center
・ Perimeter Church
・ Perimeter fence
・ Perimeter Highway (disambiguation)
・ Perimeter Highway (Winnipeg)
・ Perimeter Institute for Theoretical Physics
・ Perimeter Mall
・ Perimeter surveillance radar
・ Perimetrium
・ Perimkend


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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 + \cdots + a_n = \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 \int_0^L \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



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