Assuming the "18 inches round" refers to the circumference, the area is 25.8 sq inches.
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if the pizza is round then you use Pi X 7.5 X 7.5
15.7
12 inches is the diamter so 6 inches is the radius. The area is 36Pi or about36x3.14 which is about 113 square inches
formula used is (pi)x(radius squared)= square inches (3.14)x(5x5)= 78.5 square inches
12.5664 Sq.In.