Pizza Math Problems - TheRescipes.info PIZZA PROBLEMS | MATHCOUNTS Foundation great . Aug 2, 2021The small pizza is 10 inches in diameter and has an area of π × 52 = 25π in2. The cost per square inch for a small pizza is, therefore, $9.95 ÷ 25π in2 ≈ $0.13/in2. The difference in price per square inch between the large and the small is, therefore, $0.13 - $0.08 = $0.05.