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Math Help - prove , ray of circle inside the square

  1. #1
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    prove , ray of circle inside the square

    square around the circle :

    area of square = 2r^2

    area of circle = Pi r^2

    area of square / area of circle = pi / 4

    area of square based on ray r :

    area of square = r^2

    Area of circle = 1/4 Pi * r^2

    area of square / area of circle => 1r^2 / 1/4 pi r ^ 2 = 4 / pi

    find ray dependence from relation area of circle to area of square :


    4 / pi * ( pi * r^2 ) = 4 ( area of square around the circle is known = 4 )
    4r^2 = 4
    x = 1


    there is not incorrect, ray is dependence from area of square
    Last edited by razera; July 9th 2013 at 04:49 AM.
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  2. #2
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    Re: prove , ray of circle inside the square

    Well, first of all, the area of the square is not \displaystyle \begin{align*} 2r^2 \end{align*}, it's \displaystyle \begin{align*} (2r)^2 = 4r^2 \end{align*}.
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