Math
posted by Joseph .
The length of a rectangle is twice its width if the area of the rectangle is 200 m squared, find its perimeter.

A = Lw
w = width
2w = length
200 = w(2w)
200 = 2w^2
100 = w^2
10 = w
P = 2L + 2w
w = 10
L = 2w = 20
P = 2(10) + 2(20)
P = ?