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