The formula you use to find the volume of a pyramid equals 1/3 base area times the pyramid height
The base area formula depends on the shape of the pyramid base.
For example, the base can be square,rectangular, or even triangular.
Here is a list of the formulas for calculating the base area of different types of pyramids.
Base area formulas
The reason why you multiply the base area and height by 1/3 is because you can fit three pyramids in an equal size prism.
The video works two examples of finding the volume of a pyramid.
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