Math: Diameter of pizza

Question

A pizzaresturant is offering three different pizza's in different sizes.

The smallest Pizza has a diameter of 20 centimeter. The medium-large has a diameter of 30 centimeter. The largest Pizza has a diameter of 40 centimeter. All the pizza's has a 1,25cm thickness. We assume that when eating the pizza, each bite is 5cm3.

Question:

Show that the volume of the smallest pizza is 393 cm3

Answer 1

There is a lot of extraneous informationπ in this question. All you really need to know is

V = π(d/2)²t

V = volume = ?

d = diameter =20 cm

t = thickness = 1.25 cm

V = π(20/2)²(1.25) cm³ = 392.7 cm³