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.)
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A=πr^2, but A=169π
169π=πr^2, then pie will cancel out to get;
finding the square root on both sides, we have;
r= 13 inches
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