Video (I.47) Pythagorean Theorem, Euclid's Proof

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http://pythagoreanmath.com/euclids-elements-book-1-proposition-47/

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In proposition 47, we prove that given any right triangle, and square opposite the right angle is always equal to the sum of the other two squares.

Playlist of Book 1 of Euclid's Elements:
https://www.youtube.com/course?list=ECFC65BA76F7142E9D