Corollary: Cor. 12.07: Prism on Triangular Base divided into Three Equal Tetrahedra
(related to Proposition: Prop. 12.07: Prism on Triangular Base divided into Three Equal Tetrahedra)
(Corollary to Proposition 7 from Book 12 of Euclid's “Elements”)
And, from this, (it is) clear that any pyramid is the third part of the prism having the same base as it, and an equal height (Which is) the very thing it was required to show.
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Adapted from (subject to copyright, with kind permission)
- Fitzpatrick, Richard: Euclid's "Elements of Geometry"