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Joe Horton's avatar

Not 100% sure, but it seems that the "ab"s that you have should be ab/2....

I have a book that contains something like 450-500 separate proofs of Mr. Pythagoras' idea. Not many were printed, so if you want one, it's used bookstore city.

Euclid's proof is arguably the toughest to understand--until you lay it out, preferably color-coding the equal triangles. Then it's really quite clever.

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