the radius of a circle when the numeric values of the circumference and the area are equal?

October-A month of math

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  • 1 decade ago
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    A = πr² = C = πd = 2πr

    πr² = 2πr

    r² = 2r

    r = 2

    .

  • 1 decade ago

    C=2(pi)r

    A=(pi)r^2

    2(pi)r = (pi)r^2 cancel out pi

    2r=r^2 what number for r would make these equal to eachother?

    There is only one number that is the same squared as it is when multiplied by 2, and that is 2 since 2 times itself is the same as 2 times 2.

    The radius is 2.

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