Compare two round pizzas by area and optional price per unit area.
Formula
Round pizza area = π × (diameter ÷ 2)². If prices are entered, price per square unit = price ÷ area.
Example: A 40 cm pizza has about 77.8% more area than a 30 cm pizza.
Scope
This compares geometric area only. Crust width, toppings, thickness and portion preference are not modeled.