The circumference of a circle has the formula: 2*pi*r. So, we could easily determine the value of r.
C = 2*pi*r
12*pi = 2*pi*r
12 = 2r
r = 12/2
r = 6 inches
Knowing the r, we could find the area which has the formula
A = pi*r^2
A = pi*6^2
A = 113.1 square inches
