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

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

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X.91 Proposition X.91

If an area be contained by a rational straight line and a first apotome, the side of the area is an apotome.

Proof

Dual of X.54 for apotomes.

lines 74–74 in main.tex