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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.\" more...

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

Circles

For circles the equation is

$\text{[math]}$

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

(The dot means multiply or times)