Proof Without Words

Author:
Šárka Voráčová, Steve Phelps
Drag the points in the sketch below. What do you notice? What does this prove? How does this prove it?
GeoGebra Applet
Proof by H. Perigal (1830) and H. E. Dudeney (1917) See Cut the Knot: Pythagorean Theorem

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