If sum of two angles is 180°, they are supplementary.

 

For example

12.jpg

 

60° + 120° = 180°

Since, sum of both angles is 180°

So, they are supplementary

 

Are these angles supplementary?

13.jpg

68° + 132° = 200°

  ≠ 180°

 

Since, sum of both the angles is not 180°

So, they are not supplementary

 

Are these angles supplementary?

14.jpg

 

100° + 80° = 180°

 

Since, sum of both the angles is 180°

So, they are supplementary.

 

Are these angles supplementary?

15.jpg

  135° + 45° = 180°

 

Since, sum of both the angles is 180°

So, they are supplementary.

 

Are these angles supplementary?

16.jpg

110° + 50° = 160°

  ≠ 180°

 

Since, sum of both the angles is not 180°

 

Are these angles supplementary?

17.jpg

105° + 65° = 170°

  ≠ 180°

 

Since, sum of both the angles is not 180°

So, they are not supplementary

 

Are these angles supplementary?

18.jpg

50° + 130° = 180°

 

Since, sum of both the angles is not 180°

So, they are not supplementary

 

Are these angles supplementary?

19.jpg

45° + 45° = 90°

≠ 180°

 

Since sum of both angle is not 180°

So, they are not supplementary

 

  1. Chapter 5 Class 7 Lines and Angles
  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.