The question cannot be answered because it is not clear whether the comparison is meant to be between the perimeter or the area.
Also it would have been necessarily to assume, without justification, that
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What is a "8 inch ball" ? Is 8 inches the diameter ? Then its diameter is 8 inches. Is 8 inches the radius ? Then its diameter is 16 inches. Is 8 inches the circumference ? Then its diameter is about 2.546 inches (rounded).
A circle with an 8-inch diameter has a perimeter of 25.1 inches.
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The area of a circle with an 8 inch diameter is approximately 50.27 square inches.
square pizza = 15 * 15 = 225 square inches round pizza = 3.1416 * 8 * 8 = 201.06 square inches So square pizza is bigger area.