Pythagorean theorem

Posted by Robert Holmes on
URL: http://friam.383.s1.nabble.com/Pythagorean-theorem-tp526389.html

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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