Q83 of 113 Page 128

In Fig. 5.43, write all the pairs of supplementary angles.

The pairs of supplementary angles are :

i) 7 and 2

ii) 1 and 8

iii) 3 and 6

iv) 6 and 5

v) 5 and 4

vi) 4 and 3

If two angles have a common vertex and their arms form opposite rays (Fig. 5.41), Then,

A. how many angles are formed?

B. how many types of angles are formed?

C. write all the pairs of vertically opposite angles.

In (Fig 5.42) are the following pairs of angles adjacent? Justify your answer.

What is the type of other angle of a linear pair if

A. one of its angle is acute?

B. one of its angles is obtuse?

C. one of its angles is right?

Can two acute angles form a pair of supplementary angles? Give reason in support of your answer.