GRE

简答题 The radius of circle A is one more than the radius of circle B．What is the difference between the circumferences of circle A and circle B?

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D．If the radius of circle B is r，then the radius of circle A is r+1．The circumference of circle B is 2πr and the circumference of circle A is2n(r+1)=2πr+27π．Thus，the circumference of circle A is 2πmore than the circumference of circle B．

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