So I assume you are talking about In any right triange, the area of the square whose side is the hypotenuse (the side opposite the right angle) is equal to the sum of the areas of the squares whose sides are the two legs (the two sides that meet at a right angle It is "true" just because it is. We can prove that it is true in many many ways. In fact, there are entire books filled with various proofs. Here is a link for you with a many easy to understand visual proofs.
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Pythagoras i think you mean "Pythagoras' theorem" and it was invented by a man named Pythagoras
Well, Pythagoras being a person, would have to have been made by another two persons. Unless you're referring to Pythagoras's theorem, in which I'd have to say Pythagoras. His theory was later proved by one of his followers.
He created a proof.
IT is believed that Pythagoras fled from the city to Metapontum and died of self-starvation. Another theory is that he was killed along with his followers. There is no accurate account of his death, however.
Pythagoras' theorem is only a theory because when the sides of a right angle triangle are equal then the length of its hypotenuse will be an irrational number which can't be finally determined.