Assuming you're talking about a circle, divide the diameter by 2, square your answer and multiply by pi (3.14). Your answer should be in the region of 175 in2.
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176.714586764 square inches.
176.71 square inches.
15 x 3.1416, call it 47 and an eighth inches.
square pizza = 15 * 15 = 225 square inches round pizza = 3.1416 * 8 * 8 = 201.06 square inches So square pizza is bigger area.
pi times the square of 7.5 = almost exactly 176¾ sq in.