Hello,
Area of the circle=
πr^2
Apply the information that we had from the test into this formula:
12.56=πr^2
Divided π or 3.14 from both side
r^2=4
Square root this
√r^2=√4
r=2 feet.
Circumference of the circle=
2πr
C=2π×2
C=4π
C=12.56 feet. As a result, the circumference of the circle is 12.56 feet. Hope it help!