**The Pythagorean theorem or Pythagoras' theorem is a relation in Euclidean geometry among
the three sides of a right triangle.**

"The square of the hypotenuse is equal to the sum of the squares of the other two sides."

This theorem, applied in a right triangle, calculates one of the lengths according to the others. This theorem has the name of a mathematician and philosopher of ancient Greece, Pythagoras of Samos, even if the result was independently discovered in several other cultures long before.

In a right triangle, with the hypotenuse in C, we have:

C² = A² + B²Calculate the side of a right triangle from two known values :

Remarks :

Enter the two known values to know the third one.