A movie in which each frame is a diagram that proves the Pythagorean theorem (shown here for the case of acute angle 60 degrees). See http://jzimba.blogspot.com/2009/11/y-x-x-y-consequence-thereof.html. Also see See J. Zimba, "On the Possibility of Trigonometric Proofs of the Pythagorean Theorem," Forum Geom. 9, pp. 275-278 (2009).
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