Answer:
see below
Explanation:
The area of a square is given by
A = s^2 where s is the side length
36 = s^2
Taking the square root of each side
sqrt(36) = sqrt(s^2)
6 = s
The side length of the pen is 6 ft
To find the perimeter of a square
P = 4s
P = 4*6 = 24
He will need 24 ft of fencing