The word hypotenuse comes from a Greek word hypoteinousa which means ‘stretching under’. The hypotenuse is the longest side of a right angled triangle and is opposite to the right angle.

**Formula to calculate the length of the hypotenuse.**

The method below is known as the pythagorean theorem. Whereby, to find the hypotenuse of the triangle, you square(multiply a number by itself) the base (a²) and the height (b²) and then add them together to get the square of the hypotenuse (c²). Then find the square root of ‘c²’ to get the length of the hypotenuse.

**Example:**

Calculate the hypotenuse of the following right angled triangle.

Therefore , the hypotenuse of the triangle is 5 cm.