Which has the greatest surface area two pizza that have 14 inch diameters or one pizza that has a 20 inch diameter

Surface area of a pizza can be calculated using the same formula as area of a circle.
Formula of area of circle: 2 × pie × radius^2


A 14 inch diameter pizza has a radius of 14 inch ÷ 2 = 7 inch.

Surface area of one 14 inch pizza:

Surface area of two 14 inch pizzas:

Surface area of one 20 inch pizza:


Compare the coefficients of pie, or the number towards the left of pie. The number is greater for the 20 inch pizza, since 200 > 196, 200pie > 196pie. 20 inch pizza has greater surface area than two 14 inch pizzas.

Hope this helps! :)