Question

The length of a rectangle is twice its width.
If the area of the rectangle is
200 yd 2, find its perimeter.

Answer 1

60 yds =2*20+2*10

Answer 2

Area for a rectangle is given by the formula:
A=l*w
You're given the area, A=200 sq yds
And that length, l=2w

Substituting it to the original formula you'll have:
A = l*w
A = 2w (w)
A = 2w^2
200 = 2 w^2
w^2 = 100
w = 100 yrds
Since width = 100 yrds then
length = 2w
l = 2(100)
l = 200 yards

Perimeter = 2L + 2W
= 2(200) + 2(100)
= 600 yards