9 yards.
Step-by-step explanation:
Data:
side of a square : x
10 time the perimeter of the square : 360 yards
Formula:
Perimeter of a square = 4x
10 Time the perimeter of the square = 10(4x) = 360 yards
Solution:
10(4x) / 10 = 360 / 10
4x / 4 = 36 / 4
x = 9 yards