Source — Euclid's Elements, encoded as an rrxiv paper

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XII.15 Proposition XII.15

In equal cones and cylinders the bases are reciprocally proportional to the heights; and those cones and cylinders in which the bases are reciprocally proportional to the heights are equal.

Proof

Analogue of XII.9 / VI.15 for cones and cylinders.

lines 74–74 in main.tex