Proposition: Prop. 12.06: Sizes of Pyramids of Same Height with Polygonal Bases are as Bases
(Proposition 6 from Book 12 of Euclid's “Elements”)
Pyramids which are of the same height, and have polygonal bases, are to one another as their bases.
* Let there be pyramids of the same height whose bases (are) the polygons $ABCDE$ and $FGHKL$, and apexes the points $M$ and $N$ (respectively).
* I say that as base $ABCDE$ is to base $FGHKL$, so pyramid $ABCDEM$ (is) to pyramid $FGHKLN$.
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References
Adapted from (subject to copyright, with kind permission)
 Fitzpatrick, Richard: Euclid's "Elements of Geometry"
Adapted from CC BYSA 3.0 Sources:
 Prime.mover and others: "Pr∞fWiki", https://proofwiki.org/wiki/Main_Page, 2016