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Math Help - Volume of an Ice Cream.

  1. #1
    Junior Member Spimon's Avatar
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    [Solved] Volume of an Ice Cream.

    I'm just wondering where I've gone wrong. The correct answer to this question is ~6.38 but I end up with -47, which is not possible.

    The question is to find the volume of the 'ice cream' shaped solid in the diagram below. My solution is also there. I think its the integral from 0 - pi/6 of Sin(phi) that's messing me up. I don't know why I end up with a negative number. .

    Thanks Guys & Girls.

    Last edited by Spimon; October 27th 2007 at 09:56 PM. Reason: Solved
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by Spimon View Post
    I'm just wondering where I've gone wrong. The correct answer to this question is ~6.38 but I end up with -47, which is not possible.

    The question is to find the volume of the 'ice cream' shaped solid in the diagram below. My solution is also there. I think its the integral from 0 - pi/6 of Sin(phi) that's messing me up. I don't know why I end up with a negative number. .

    Thanks Guys & Girls.
    For one thing:

    <br />
\int_0^{\pi/6}\sin(\phi)~d\phi = 1-\cos(\pi/6)<br />

    RonL
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  3. #3
    Junior Member Spimon's Avatar
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    OOohhhh that helps! Thanks
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  4. #4
    Junior Member Spimon's Avatar
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    Woooot!!! The problem was I was using P-Cos(Pi/6) in degrees more of my calculator.
    When I put it in radians mode or use -Cos(30) in degrees, it works
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