SOLUTION: An eighteen inch pizza arrived at a boys table. The crust was one inch wide all the way around the pizza. What percent of the pizza is crust?

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Question 554607: An eighteen inch pizza arrived at a boys table. The crust was one inch wide all the way around the pizza. What percent of the pizza is crust?
Answer by Alan3354(69443) About Me  (Show Source):
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An eighteen inch pizza arrived at a boys table. The crust was one inch wide all the way around the pizza. What percent of the pizza is crust?
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The outside radius is 9, the inside is 8 inches
It's a function of the square of the radius.
(8^2/9^2) = 64/81 is the inside
17/81 is the crust
==~ 21% is the outside crust.