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OpenStudy (anonymous):
What is the circumference of a circle with an area of 64pi ? a) 8pi b) 32pi c) 64pi d) 16pi
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OpenStudy (anonymous):
Area = Pi*r^2 = 64*pi Cancle the pi on both sides, you have: r^2 = 64 Take square root, r = 8. Circumference = 2*r*pi Circumference = 2*8*pi = ?
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