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Math Help - Find the volume

  1. #1
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    Find the volume

    Find the volume of y=sqrt[25-x^2], y=0, x=2, x=4 about the x axis.

    Integrating that becomes a mess when I tried it, and it gets a wacky integral that can't be right.
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  2. #2
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    Quote Originally Posted by sfgiants13 View Post
    Find the volume of y=sqrt[25-x^2], y=0, x=2, x=4 about the x axis.

    Integrating that becomes a mess when I tried it, and it gets a wacky integral that can't be right.
    I assume that you want to calculate the volume if the given area rotates around the x-axis.

    V_{rot}=\pi \cdot r^2 \cdot dx with r = y.

    Then you have:

    V_{rot}=\int_2^4\left(\pi \cdot \left(\sqrt{25-x^2}\right)^2 \right) dx = \pi \left [25x-\dfrac13x^3\right]_2^4 = \dfrac{94}3 \pi
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