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Math Help - Circle area and circumference

  1. #1
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    Circle area and circumference

    Assuming X=360, is it possible to find the area and circumference of the circle? And, if so, how?



    TIA!
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  2. #2
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    Hi there, I don't think it is possible to find the measurements you require.

    On the condition that the triangle with hypotenuse X had shorter sides that were equal then maybe it would be.

    Therefore if x = 360 units in length then the radius is 246.6

    Circumerence is 2\pi\times r = 2\pi\times 246.6 \approx 1549 units

    Area is \pi\times r^2 = \pi\times 246.6^2 \approx 190948 units squared

    How, using pythagora's theorem.
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  3. #3
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    Quote Originally Posted by quickquestion View Post
    Assuming X=360, is it possible to find the area and circumference of the circle? And, if so, how?

    TIA!
    Hi quickquestion,
    The solution is fairly simple...
    Radius = X
    look at the bounding rectangle you have around X
    The other diagonal is equal to the radius and also equal to X
    Therefore the Radius is equal to X.

    Circumference = 2*pi*X = 2 * 3.14 * 360 = 2261.9
    Area = pi * X * X = 3.14 * 360 * 360 = 407150.4
    Attached Thumbnails Attached Thumbnails Circle area and circumference-quickquestioncircle.png  
    Last edited by bowline; August 30th 2009 at 03:54 PM.
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