(I.16) Exterior Angle of a Triangle is Greater Than the Opposite Interior Angles, Proof

Описание к видео (I.16) Exterior Angle of a Triangle is Greater Than the Opposite Interior Angles, Proof

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In proposition 16 of Euclid's Elements, we prove that if any side of a triangle is extended then the exterior angle is always greater than either of the opposite interior angles.

Playlist of Euclid's Elements in link below:
   • Euclid's Elements Book 1  

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