The radius is ________inches.

Mathematics
Tutor: None Selected Time limit: 1 Day

15).  The area of a circle with radius r is given by the formula A=πr2. If a circle has area 169π square inches, what is the radius?

The radius is ________inches.

(Simplify your answer. Type an integer or a fraction.)

Jun 22nd, 2015

Thank you for the opportunity to help you with your question!

A=πr^2, but A=169π

169π=πr^2, then pie will cancel out to get;

169=r^2

finding the square root on both sides, we have;

sqrt(169)=r

r= 13 inches

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 22nd, 2015

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Jun 22nd, 2015
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