math

The circumference of a circle = 20 pi. If the circle is cut in half, what is the area of one of the resultant halves ?

please answer and explain

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asked by Thomas
  1. C = 2 r pi


    20 pi = 2 r pi Divide both sides by 2 pi

    10 = r

    r = 10


    A = r ^ 2 pi

    A = 10 ^ 2 pi

    A = 100 pi


    A / 2 = 100 / 2 = 50 pi

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    posted by Bosnian

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