To measure the size of a pizza, you would typically measure the diameter of the pizza. The diameter is the distance across the widest part of the circular pizza. You can measure the diameter by using a ruler or measuring tape from one edge of the pizza to the opposite edge passing through the center. Once you have the diameter, you can calculate the size of the pizza using the formula for the area of a circle (πr^2), where r is the radius (half the diameter) of the pizza.
