SELINA Solutions for Class 9 Maths Chapter 25 - Complementary Angles

Page / Exercise

Chapter 25 - Complementary Angles Exercise Ex. 25

Question 1

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Solution 1

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles 

Question 2

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Solution 2

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles 

Question 3

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Solution 3

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles 

Question 4

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Solution 4

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles 

Question 5

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Solution 5

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Question 6

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Solution 6

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles 

Question 7

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Solution 7

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles 

Question 8

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Solution 8

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles 

Question 9

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Solution 9

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles 

Question 10

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Solution 10

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Question 11

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Solution 11

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Question 12

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Solution 12

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles 

Question 13

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Solution 13

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles 

Question 14

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Solution 14

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles 

Question 15

Show that:

tan 10° tan 15° tan 75° tan 80° = 1

Solution 15

L.H.S.

= tan 10° tan 15° tan 75° tan 80°

= tan (90° - 80°) tan (90° - 75°) tan 75° tan 80°

= cot 80° cot 75 ° tan 75° tan 80°

= (cot 80° tan 80°)(cot 75° tan 75°)

= (1)(1)

= 1

= R.H.S.

Question 16

Show that:

sin 42° sec 48° + cos 42° cosec 48° = 2

Solution 16

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles  

Question 17

Express each of the following in terms of angles between 0°and 45°:

(i) sin 59°+ tan 63°

(ii) cosec 68°+ cot 72°

(iii)cos 74°+ sec 67°

Solution 17

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Question 18

For triangle ABC, show that:

(i) Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

(ii) Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Solution 18

(i) We know that for a triangle Selina Solutions Icse Class 9 Mathematics Chapter - Complementary AnglesABC

 Selina Solutions Icse Class 9 Mathematics Chapter - Complementary AnglesA + Selina Solutions Icse Class 9 Mathematics Chapter - Complementary AnglesB + Selina Solutions Icse Class 9 Mathematics Chapter - Complementary AnglesC = 180°

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

(ii) We know that for a triangle Selina Solutions Icse Class 9 Mathematics Chapter - Complementary AnglesABC

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles A + Selina Solutions Icse Class 9 Mathematics Chapter - Complementary AnglesB + Selina Solutions Icse Class 9 Mathematics Chapter - Complementary AnglesC = 180°

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary AnglesB + Selina Solutions Icse Class 9 Mathematics Chapter - Complementary AnglesC = 180° - Selina Solutions Icse Class 9 Mathematics Chapter - Complementary AnglesA

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Question 19

Evaluate:

(i) Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

(iii) Selina Solutions Icse Class 9 Mathematics Chapter - Complementary AnglesSelina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

(iv) Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

(v) Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

(vi) Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

(vii) Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

(viii) Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

(ix) Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Solution 19

(i)

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles


Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

 

(iii) Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

 

(iv) Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

 

(v) Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

 

(vi) Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

 

(vii) Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

 

(viii) Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

 

(ix) Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Question 20

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Solution 20

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles 

Question 21

In each case, given below, find the value of angle A, where 0° A 90°.

sin (90° - 3A).cosec 42° = 1

Solution 21

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles

Question 22

In each case, given below, find the value of angle A, where 0° A 90°.

cos (90° - A).sec 77° = 1

Solution 22

Selina Solutions Icse Class 9 Mathematics Chapter - Complementary Angles