Math CentralQuandaries & Queries


Question from A. Ahamed:

what is the formula to find out volume of a pyramid with individual length and breadth? For example bottom size is 6.5m x 6.5m, top size 1.5m x 4.2m and height 0.8m. please send me the formula.

Hi there.

The volume of a pyramid is the area of the base times the height, then divided by 3. What you are describing is a pyramid with the top missing, so that's just a pyramid minus a pyramid.

We call it a frustum.

Since you know the areas of the parallel top (T) and bottom (B) and the height between them (H), you can use the formula


Hope this helps,
Stephen La Rocque

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