What is the perimeter of a rectangle with sides of 12 inches and 18 inches?
The perimeter means "the distance around a figure. To find the perimeter of any figure, you simply add all of it's sides together.
Sometimes it's helpful to imagine putting a fence around the shape - you have to know how much distance there is around the "property", so you add all of the sides together.
So the perimeter of this rectangle is
So the perimeter of this figure is