Perimeter

From Wikipedia, the free encyclopedia

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".

Contents

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 soil or fertilizer.

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 side length.

For circles the equation is

P = 2 \cdot \pi \cdot r

or

P = d \cdot \pi
  • P stands for the perimeter,
  • 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)

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