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Math Help - volume of sphere

  1. #1
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    volume of sphere

    how to get to the volume of sphere with radius r using the integrals..

    that's what i tried..

    \int \Pi r^2 dr = \frac{\Pi r^3}{3}

    I'm missing 4 :P
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by metlx View Post
    how to get to the volume of sphere with radius r using the integrals..

    that's what i tried..

    \int \Pi r^2 dr = \frac{\Pi r^3}{3}

    I'm missing 4 :P
    use volumes of revolutions. rotate a semi circle of radius r in the upper half-plane, centered at the origin about the x-axis. use the disk method
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