2pie r1 - 2pie r2=30cm find the radius of circle full explaination
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Step-by-step explanation:
Pi is the ratio of circumference over diameter. 2 and r come from the formula of diameter. You have to find circumference of a circle. ... 2 and r comes because it equals the diameter. So pi times 2 times r is basically circumference over diameter times diameter which gives circumference.
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answer is 8.34 cm
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