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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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I.23 Proposition I.23

On a given straight line and at a point on it to construct a rectilineal angle equal to a given rectilineal angle.

Proof

Cut equal segments by I.3, construct the matching triangle by I.22, apply I.8.

lines 74–74 in main.tex

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