Exterior angle of triangle

Last updated at August 2, 2026 by

For ∆ABC

25.jpg

∠1, ∠2, ∠3 are exterior angles

 

We can also  write as

Exterior angle of triangle - Part 2

∠1, ∠2, ∠3 are exterior angles

But, how to differentiate?

We go in same direction always

 

For example

In Δ ABC

Exterior angle of triangle - Part 3

 

We can make a line on part A as

Exterior angle of triangle - Part 4

Three is a property of exterior angles

 

Remove Ads
Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh is an IIT Kanpur graduate and has been teaching for 16+ years. At Teachoo, he breaks down Maths, Science and Computer Science into simple steps so students understand concepts deeply and score with confidence.

Many students prefer Teachoo Black for a smooth, ad-free learning experience.