The longest side of a right angled triangle is called the
hypotenuse of the triangle.
length of the hypotenuse of a right triangle can be found
using the Pythagorean theorem, which states that the square
of the length of the hypotenuse equals the sum of the squares
of the lengths of the two other sides.
example, if one of the other sides has a length of 3 meters
(when squared, 9 m²) and the other has a length of 4
m (when squared, 16 m²). Their squares add up to 25 m².
The length of the hypotenuse is the square root of this, i.e.
Example of a Hypotenuse: