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OpenStudy (anonymous):
WHY does the circumference of a circle=2*pi*r?
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OpenStudy (anonymous):
its the derivative of area
OpenStudy (amistre64):
because pi is actually the ratio of a circles circumference to its diameter. pi = C/d ; to which: C = d pi
OpenStudy (amistre64):
Your pretty much asking why pi is equal to pi :)
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