The perimeter of a polygon is the sum of all the lengths of its sides. Since a rectangle has two pairs of sides, if we call the longer side length and the shorter side width, then
Perimeter = length + length + width + width.
We can shorten this formula if we let be the perimeter, be the length and be the width:
You see, you don’t have to memorize the formula as long as you know the concept and you know the shape of the polygon. In some of the examples, below, I did not show use the shorter formula since they can be solved intuitively. Continue Reading