I'm not very sure but I know there is over 300.
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Pythagoras, with alternative proofs from lots of others.
Yes. There are hundreds of proofs of the theorem: some were brought together by ES Loomes in a book called The Pythagorean Proposition.
Although the Pythagorean theorem (sums of square of a right angled triangle) is called a theorem it has many mathematical proofs (including the recent proof of Fermats last theorem which tangentially also prooves Pythagorean theorem). In fact Pythagorean theorem is an 'axiom', a kind of 'super law'. It doesn't matter if anyone does oppose it, it is one of the few fundamental truths of the universe.
For a number of proofs see: http://www.cut-the-knot.org/pythagoras/ Proof 6 seems to be the most straightforward.
The Pythagorean theorem is a2 + b2 = c2