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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.13 Proposition I.13

If a straight line set up on a straight line make angles, it will make either two right angles or angles equal to two right angles.

Proof

Drop a perpendicular by I.11; Common Notions 1–2 sum the resulting two right angles to the unequal-case angle sum.

lines 74–74 in main.tex