Answer:
9 inches
Explanation:
A square has an area of 81 in^2
A = s^2
81 = s^2
Take the square root of each side
sqrt(81) = sqrt(s^2)
9 = s
The side length is 9 inches
A square has a perimeter of 36 in
P = 4s
36 = 4s
Divide each side by 4
36/4 = 4s/4
9 = s
Each side is 9 inches