The length of a rectangle is twice its width. if the area of the rectangle is 162 cm2, find its perimeter.

Let the width of the rectangle be x

Then, the length of the rectangle will be 2x

The area of the rectangle will be

2x (x) = 2x^2

Since the area of the rectangle is 162cm2

2x^2=162

x^2=81

x=9

Width of the rectangle=9

Length of the rectangle=9x2=18

Perimeter of a rectangle

=2 (width) + 2 (length)

=2 (9) + 2 (18)

=54cm