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OpenStudy (anonymous):
a dartboard consists of 2 concentric circle. the probability of hitting the inner circle is 16%. if the outer circle has a diameter of 20 inches, what is the radius of the inner circle.
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Directrix (directrix):
The outer circle has a radius of 10 given that its diameter is 20. The outer circle's area is 100 pi. |dw:1361335878944:dw|
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