Euclid — "If a straight line touch a circle, and from the point of contact there be drawn …"

If a straight line touch a circle, and from the point of contact there be drawn across in the circle a straight line cutting the circle, the angles which it makes with the tangent will be equal to the angles in the alternate segments of the circle.
Euclid — Euclid Ancient · Father of geometry

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Theorem 32, Book III of 'Elements'

Date: c. 300 BCE

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