Euclid:Proposition/XII/4

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Proposition

In the words of Euclid:

If there be two pyramids of the same height which have triangular bases, and each of them be divided into two pyramids equal to one another and similar to the whole, and into two equal prisms, then, as the base of one pyramid is to the base of the other pyramid, so will all the prisms in the one pyramid be to all the prisms, being equal in multitude, in the other pyramid.

(The Elements: Book $\text{XII}$: Proposition $4$)


Sources