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Math Help - Cone Height

  1. #1
    tmrwcomestoday
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    Cone Height

    Ok, so here's the problem:

    "The volume of a cone is found by using the formula V = 1/3*Pi(Squared)*h

    Sarah is experimenting to find how high she needs to build a concial storage tower. She knows the volume of a material to be stored is 112 m(cubed). She decides to rewrite the formula so that h is the subject and then experiment different values of r.

    Write the formula with h as the subject."

    Only looking for help to find the solution. Formula would be fine.

    Thank you.
    Last edited by tmrwcomestoday; March 8th 2008 at 06:18 PM.
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  2. #2
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    earboth's Avatar
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    Quote Originally Posted by tmrwcomestoday View Post
    Ok, so here's the problem:

    "The volume of a cone is found by using the formula V = 1/3*Pi*r(Squared)*h (I suppose)

    Sarah is experimenting to find how high she needs to build a concial storage tower. She knows the volume of a material to be stored is 112 m(cubed). She decides to rewrite the formula so that h is the subject and then experiment different values of r.

    Write the formula with h as the subject."
    V = \left[\frac13 \cdot \pi \cdot r^2\right] \cdot h . To get h you have to get rid of the square bracket. Divide by the bracket and you should come out with:

    h = \frac{3V}{\pi \cdot r^2}
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