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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.24 Proposition X.24

The rectangle contained by medial straight lines commensurable in length is medial.

Proof

Product of two medials in rational length-ratio is again the geometric mean of two rationals (Definition XIII.3).

lines 74–74 in main.tex