The Pythagorean Theorem
In a right-angled triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides. This is written as:
Here, c is the hypotenuse, and a, b are the other two sides.
Example
If a = 3 and b = 4, then:
This is one of the most famous results in mathematics, used widely in geometry, physics, and engineering.