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How much greater, in square inches, is the area of a circle of radius 20 inches than a circle of diameter 20 inches? Express your answer in terms of $\pi$.

 Apr 5, 2020
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First circle: pi(20)^2=400pi inches squared:

 

Second cirle"pi(20/2)^2=100 pi inches squared.

 

Thus, 400pi-100pi=300 pi inches squared(square inches).

 Apr 5, 2020

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