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Find the volume of frustum of a pyramid with square base of side b, square top of side a, and height h.

Usually when I do these volume problems, I treat them as an equation rotating around an axis, but this object has flat sides so I don't know how to begin.

http://upload.wikimedia.org/wikipedia/en/f/f8/Pyramid_frustum_for_Moscow_papyrus_14.jpg [Broken]

The solid looks like that.

I know I need to make an integral from 0 to h of the area of the square but while I usually replace the radius in the formula with an equation, I cannot do so here.

Thanks in advance.

Usually when I do these volume problems, I treat them as an equation rotating around an axis, but this object has flat sides so I don't know how to begin.

http://upload.wikimedia.org/wikipedia/en/f/f8/Pyramid_frustum_for_Moscow_papyrus_14.jpg [Broken]

The solid looks like that.

I know I need to make an integral from 0 to h of the area of the square but while I usually replace the radius in the formula with an equation, I cannot do so here.

Thanks in advance.

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