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Euclid's Proof of the Pythagorean Theorem Proof

(a.k.a. “The Peacock”,“The Windmill”, or “The Bride's Chair”)

This applet is labeled the same way as the Euclid's proof in Sir T. Heath's translation: https://www.cut-the-knot.org/pythagoras/Proof1.shtml (Cut the Knot website)