Find the square inches for 12 inches in diameter?

The formula for finding the Area (square inches) of a circle is A = Pi x R-squared where Pi is 3.1416 and R is the Radius. Radius is one-half of the Diameter, so one-half of 12 is 6. Now, using the formula, do the math: A = 3.1416 x (6 x 6) = 3.1416 x 36 = 113.0976 square inches.