# What is exterior angle of a triangle and How to find it? Explained in detail

Learn and know everything about exterior angle of a triangle, I mean what is it and how do we find the value of it. Actually this is the one of the important properties of a triangle.

To understand this we have to know the basics things about a triangle. What is a triangle means? How many sides a triangle contains? How many angles it has? So all these you have to know. Then definitely you will get some basic idea about what may be exterior angle of a triangle. Now we will learn all about exterior angles in a triangle. We will start learning from exterior angle definition, how to find exterior angle, what will be the sum of all the exterior angles and so on.

## One of the best definitions for the exterior angle of triangle as follows:

We know that a triangle is made up of three line segments. If any one of the line segment is extended towards the outside then its forms an angle. As the angle is formed outside of the triangle so we call it as exterior angle. This is the simple and best definition we can give for exterior angle of a triangle.

For any triangle, there exist exactly 3 exterior angles. Interior and exterior angles of a triangle both will be beside to each other.

### How to determine the exterior angle of a triangle?

For finding the value of exterior angle for any triangle we have a general formula. See for any triangle “the exterior angle value will be always equal to the sum of the opposite interior angles”. Suppose if a triangle is given with all the three interior angles then for finding exterior angle just add opposite interior angles for that exterior angle.

Observe the above given step by step its showing about exterior angle of a triangle.

#### Sum of all the three exterior angles of a triangle is?

A triangle consists of three exterior angles. All the three angles we can find by applying above given method. Then if we add all the three exterior angles how much we will get? So, remember for any kind of triangle if we find the sum, it will be equal to ${ 360 }^{ 0 }$.