A Greek mathematician Pythagoras identified that the direct relation between sides of a right triangle. He proved that the square of length of hypotenuse is equal to sum of the squares of lengths of opposite and adjacent sides of that right triangle. Therefore, it is called Pythagorean Theorem.
Then, the Pythagorean Theorem is written as the following algebraic equation.
$\large c^2 = a^2 + b^2$
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