http://www.cut-the-knot.org/pythagoras/index.shtml
Csak ezen az oldalon 98 bizonyítás van, de a lényeg ez az idézet:
"W. Dunham [Mathematical Universe] cites a book The Pythagorean Proposition by an early 20th century professor Elisha Scott Loomis. The book is a collection of 367 proofs of the Pythagorean Theorem and has been republished by NCTM in 1968."