March 29, 2017

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The ratio of the radii of two circles is 2:3. Find the ratio of their circumference and the ratio of their areas

  • math - ,

    since C = 2piR

    the ratio of circumferences is the same as the ratio of the radii.

    That is, if we substitute kR for R, we get

    2pi(kR) = k*2piR = kC

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