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Math Help - circumference of a circle

  1. #1
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    Talking circumference of a circle

    If the circumference of a circle is 4*pi/3, then what is half of its area?

    a 2*pi/9
    b.4*pi/9
    c.8*pi/9
    d.2*pi squared/9
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  2. #2
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    Quote Originally Posted by Schatzle06 View Post
    If the circumference of a circle is 4*pi/3, then what is half of its area?

    a 2*pi/9
    b.4*pi/9
    c.8*pi/9
    d.2*pi squared/9
    2\pi r=\frac{4\pi}{3}
    Divide by \pi to get,
    2 r=4/3
    Divide by 2,
    r=2/3.
    Thus,
    A=\pi (2/3)^2=(16/9)\pi
    Half of that is,
    (8/9)\pi
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