Re today's discussion about proofs of the Pythagorean theorem - here's a link to a page with ~80 proofs: http://www.cut-the-knot.org/pythagoras/index.shtml
Proof #4 is the one that Frank & I were so impressed with; #1 is the one that Nick (along with anyone who graduated St Johns) failed to reproduce; #5 is the one due to Pres. Garfield (an intelligent president! those were the days...). And you can get an "extra-geometric" proof that relies on Newton's 2nd law at http://www.cut-the-knot.org/pythagoras/mech.shtml Robert
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