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5:36
YouTube
Euler's Academy
Euclid's Elements Book 1: Proposition 21
This is the twenty first proposition in Euclid's first book of The Elements. This proof shows that if you draw two lines meeting at a point within a triangle, those two lines added together will be smaller than the two sides of the original triangle added together. Also the angle formed by the two straight lines will be bigger than the angle ...
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