Round or square?
If the price is the same, would you prefer to have a 10-inch round pizza or a 9-inch square pizza?
The 9-inch square pizza is a better buy.
The area of 9-inch pizza is 9x9 = 81 square inches
and the area of a 10-inch round pizza is πR² = 3.1416 x (10/2)² = 78.54 square inches.
Reference: Wikipedia Area