Here is a lovely proof-without-words of this ancient theorem, as true today as ever it was. The right-angled triangle is yellow, the square on the hypotenuse is blue, and the squares on the other two sides are red.
This is just one of 99 proofs of Pythagoras Theorem collected by Alexander Bogomolny for his wonderfully inventive and informative cut-the-knot column that appeared from 1996 until 2012 on the Mathematical Association of America website.
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