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Home > MC2 > Chapter 6 > Lesson 6.2.5 > Problem 6-118


Whole pizzas are described by the length of their diameters. For example, a -inch pizza has a diameter of inches.

Stan the Pizza Man told a customer that a medium pizza costs and an large pizza costs . Which pizza is the better deal for the customer (that is, which one costs less per square inch)? You may use a calculator, but you must show your work.

To find the best cost per square inch, we must first find the area of each pizza.

Using the formula for the area of a circle, :
Medium pizza: .
Large pizza: .

Remember, in. and in. are the diameters of the pizzas.

Now with the area, we can determine the price per square inch of pizza. We can convert to cents for a better indicator of price.

Medium pizza: cents

 cents per square inch

Large pizza: cents

 cents per square inch