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Verified Answer :

The circumference of a circle has the formula: 2pir. So, we could easily determine the value of r.

C = 2pir
12pi = 2pir
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