Perimeter Totally Explained

Everything about The Perimeter totally explained

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".

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 triangles is

P=a+b+c

, where

a

b

and

c

stand for each side of it. For 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 measure of the side.

Circles

For circles the equation is ť

P = 2 cdot pi cdot r

or ť

P = d cdot pi

$P$ stands for the perimeter,
$r$ stands for the radius
$pi$ is the mathematical constant pi ( $pi=3.14159265...$ )
$d$ stands for the circle's diameter (twice the radius of a circle)

(The dot means multiply or times)

In General

If r is considered to be the distance from the centre of a regular polygon to one of its vertices (or in the case of a circle, the radius), the following holds true: ť

P = frac

P

stands for the perimeter,

r

stands for the radius

A

stands for the areaFurther Information

Get more info on 'Perimeter'.

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