Euclid's proof of Pythagoras' theorem

Author:
Maurice OReilly
Topic:
Pythagoras or Pythagorean Theorem
This is an illustration of the classical proof of Pythagoras' theorem. There are many other proofs, but this is the one from Euclid.
GeoGebra Applet
Play around with the vertices, A, B & C. Can you describe carefully the construction shown here?

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