He discovered how to find the length of the missing side of a right triangle, so if there was a 5 cm line and a 4 cm line he could tell the length of the other line on a triangle. The answer to the 5 cm by 4 cm would be 3 cm. That is his famous 5, 4, 3 triangle.
The formula for it is A squared plus B squared equals C squared.
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he played the lyre
Cause
he dicovered it in greece
Discover of a Mathematical formula to relate the sides of a right triangle.
the pythagorean theorem i would just like to say that he did not discover that, it was found in 800 B.C