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Volume of a Conical Frustum

What is a conical frustum I hear you say.
Well, basically it is a bucket. One end has a narrower diameter enn the other end. Like a bucket.
If you want the volume of a cone, just set one of the diameters to 0.
If you have the volume and the two other measurements and wonder how much it will fill, select the From volume (V) to height (h) section.

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Diameter top

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Diameter bottom

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Volume:

Radius (a):
Radius (b):

From volume (V) to height (h)

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Diameter top

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Diameter bottom

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Heigth (h):

Radius (a):
Radius (b):

Complete!
Congratulations you have completed all of the steps successfully
    Top and bottom

    Measure diameter Da and Db.
    This will give you the radius a and b of each side.

    Heigth (h)

    Measure the height (h) vertically and not alongside the edge.

    The math

    The formula for a conical frustum might seem difficult, and I guess coming up with the formula in the first place was.
    As it is, it's no harder to use than any other formula. Put the right numbers into the right slots, and you are there.

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