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9 February, 13:20

If the circumference of a circle is 2 pi what is the radius

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Answers (2)
  1. 9 February, 14:24
    0
    C=2pir

    r=radius

    c=circumference

    given

    c=2pi

    2pi=c=2pir

    2pi=2pir

    divide both sides by 2pi

    1=r

    radius is 1 unit
  2. 9 February, 16:34
    0
    C = 2 * pi * r

    Plug in what we know:

    2pi = 2 * pi * r

    Divide 2 pi to both sides:

    r = 1

    (Remember, anything divided by itself is equal to 1)

    A = pi * r^2

    Plug in what we know:

    A = pi * 1^2

    A = pi * 1

    A = 1 pi

    So the area is '1 pi' or just 'pi'.
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