For ∆ABC

25.jpg

∠1, ∠2, ∠3 are exterior angles

 

We can also  write as

26.jpg

∠1, ∠2, ∠3 are exterior angles

But, how to differentiate?

We go in same direction always

 

For example

In Δ ABC

27.jpg

 

We can make a line on part A as

28.jpg

Three is a property of exterior angles

 

  1. Chapter 6 Class 7 Triangle and its Properties
  2. Concept wise
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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.