# Right Triangle

By the end of this lesson, you will be able to

- define right angle.
- describe right triangle definition.
- classify different types of right triangle.

## What is Right Triangle

A triangle with one right angle or 90° is called a right triangle.

The each of rest two angles other than right angle must be acute angle.

The sum of two acute angles for a right triangle is 90°.

The two sides adjacent to right angle of a right triangle is known as legs while the longest side opposite the right angle is called the hypotenuse.

The two legs are also sometimes called base and height.

If one of the two legs is height, the other is base.

### Right Triangle Example

## Isosceles Right Triangle

An isosceles right triangle simply means an isosceles triangle as well as it is also a right triangle.

An isosceles right triangle is an isosceles triangle whose vertex angle is a right angle.

Again, an isosceles right triangle is a right triangle in which two acute angles other than right angle are equal to 45°.