Question 1045643
<pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
     *[illustration rectangle.png].
x is the length of one side of this fence
area of 400 square meters A = Lw
A = 400 = x (400/x)
P = 2L + 2w
P(x) = 2x + 2(400/x)
P(x) = 2x + 800/x