# Math 157

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A 7 inch pizza cost \$8 and a 14 inch pizza costs \$20. Tommy says the smaller pizza is a better buy because the larger pizza is twice as big and more than twice as expensive. Do you agree with his reasoning? Explain why or why not.

• Math 157 -

Area of 7 inch pizza:

A = pi * r^2
A = 3.14 * 3.5 * 3.5
A = 38.465 square inches

8/38.465 = \$0.21 per square inch

Follow the above procedure to find the area and cost per square inch of the larger pizza.

• Math 157 -

A = pi x r^2
A = 3.14 x 7 x7
A = 153.86
20/153.86 = \$0.13 per square inch

• Math 157 -

Right! :-)

• Math 157 -

Thank you!

• Math 157 -

You're welcome.

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