# What is Pythagoras theorem?

In mathematics, the Pythagorean theorem, also known as Pythagoras's theorem, is a fundamental relation in Euclidean geometry among the three sides of a right triangle. It states that 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 on the other two sides. This theorem can be written as an equation relating the lengths of the sides ab and c, often called the "Pythagorean equation":

where, c represents the length of the hypotenuse and a and b the lengths of the triangle's other two sides.

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