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Mathematics 22 Online
OpenStudy (gokuporter):

http://prntscr.com/3erk70

OpenStudy (anonymous):

c

OpenStudy (anonymous):

C = 2*pi*r

OpenStudy (anonymous):

So your r = 7.5 because, r = d/2

OpenStudy (anonymous):

So yes, your answer is C, 15pi

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