If sum of two angles is 90°, they are complementary

For example

5.jpg

 

30° + 60° = 90°

 

Since sum of both angles is 90°

So, they are complementary   

 

Are these angles complementary?

6.jpg

 

35° + 65° = 100°

 ≠ 90°

Since sum of both angles is not 90°

So, they are not complementary    

 

Are these angles complementary?

7.jpg

 

45° + 45° = 90°

Since sum of both angle is 90°

So, they are complementary   

 

 

Are these angles complementary?

8.jpg

70° + 20° = 90°

 

Since sum of both angle is 90°

So, they are complementary   

 

Are these angles complementary?

9.jpg

75° + 25° = 100°

         ≠ 90°

 

Since sum of both angles is not 90°

So, they are not complementary   

 

Are these angles complementary?

10.jpg

48° + 52° = 100°

                ≠ 90°

 

Since sum of both angles is not 90°

So, they are not complementary   

 

Are these angles complementary?

11.jpg

 

35° + 55° = 90°

 

Since sum of both angles is 90°

So, they are complementary    

 

  1. Chapter 5 Class 7 Lines and Angles
  2. Concept wise

About the Author

Davneet Singh's photo - Teacher, Computer Engineer, Marketer
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.