Okay so in order to find the circumference we would first need to find either the diameter or radius of the circle. The perimeter of the square is 40 and each side is equal. 40/4 = 10. So the length of one side is 10. The length of one side would be the diameter of the circle.
Diameter = 10
The only thing that is left is to find the circumference.
The formulas for circumference are:
C = [tex] \pi [/tex]d
C = 2[tex] \pi [/tex]r
So just multiply the diameter by pi (3.14)
10 x 3.14 = 31.4
or 10[tex] \pi [/tex] (Which would be the answer to your problem)
