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math

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The ratio of the radii of two circles is 2:3.
find the ratio of their circumferences and the ratio of their areas

  • math -

    Circumference is a linear measurement, so
    the ratio is still 2:3

    but...
    areas of circles are proportional to the square of their radii.
    so 2^2 : 3^2 = 4 : 9

  • math -

    4:9

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