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Perimeter

*** Shopping-Tip: Perimeter
The '''perimeter''' is the distance around a given two-dimensional object. The word perimeter is a Greek root meaning measure around, or literally "around measure." Perimeter can be calculated for ''any'' two dimensional object, with the right perimeter#formulas formula.

Practical Uses
Perimeter and area play a great role in today's world. Perimeter is used in calculating the border of an object such as a yard or flowerbed when a fence or other border is being installed around the edges. Area is used when all the area inside of a perimeter is being covered with something, such as a yard being covered with sod or fertilizer.

Formulas

Polygons
As a general rule, the perimeter of a polygon can always be calculated by adding all the length of the sides together. So, the formula for triangle triangles is

P=a+b+c

, where

a

b

and

c

stand for each side of it. For quadrilateral quadrilaterals the equation is

P=a+b+c+d

. For equilateral polygons,

P=na

, where n is the number of sides and a is the side length.

Circles
For circle circles the equation is :

P = 2 \cdot \pi \cdot r

or :

P = d \cdot \pi

P

stands for the perimter, *

r

stands for the radius *

\pi

is the mathematical constants mathematical constant pi (

\pi=3,14159265...

) *

d

stands for the circle's diameter

See also
See also: * Isoperimetric Theorem * Circumference * Pythagorean Theorem ca:Perímetre de:Umfang es:Perímetro fr:Périmètre it:Perimetro pt:Perímetro nl:Perimeter ru:Периметр simple:Perimeter zh:周界 Category:Elementary geometry