In the given problem, here is the solution.
Given is the circumference which is 15.7 units and pi is 3.14.
To solve the are of the circle, the formula would be A = pi(r^2).
A = c^2 / (4 pi)
A = 15.7^2 / (4 3.14)
A = 246.49 / 12.56
A = 19.625
So the answer is 19.625 sq.units.
Hope this helps you!
