Determine the perimeter of a rectangle that has a length of

Determine the perimeter of a rectangle that has a length of 21 centimeters and an area of 168 square centimeters.

Solution

The area of a rectangle is L*W where L = length and W = width.

The perimeter is 2*(L + W)

The rectangle in the problem has a length of 21 cm and its area is 168.

=> 21*W = 168

=> W = 168/21

=> W = 8

The perimeter is 2*(21 + 8) = 2*29 = 58 cm

The perimeter of the rectangle is 58 cm.