Question

The length of a rectangle is four times its width.

If the perimeter of the rectangle is 90 meters, find its length and width.

Answer 1

9 and 36 m

Explanation:

If the length of the rectangle is 4x the width, then we have that: L = 4W

Use the formula for the perimeter of the rectangle to find width W.

2L + 2W = P

2 * 4W + 2W = 90

8W + 2W = 90

10W = 90

W = 9 m

Find length L.

L = 4 x 9 = 36 m