Euclid — "If a straight line fall on two parallel straight lines, it makes the alternate a…"

If a straight line fall on two parallel straight lines, it makes the alternate angles equal to one another, the exterior angle equal to the interior and opposite angle, and the interior angles on the same side equal to two right angles.
Euclid — Euclid Ancient · Father of geometry

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Proposition 29, Book I of 'Elements'

Date: c. 300 BCE

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Found in 1 providers: grok

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