Q86 of 113 Page 128

Two lines AB and CD intersect at O (Fig. 5.44). Write all the pairs of adjacent angles by taking angles 1, 2, 3, and 4 only.

The pairs of adjacent angles are:

i) 1 and 2

ii) 2 and 3

iii) 3 and 4

iv) 4 and 1

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.

If the complement of an angle is 62°, then find its supplement.

A road crosses a railway line at an angle of 30° as shown in Fig.5.45. Find the values of a, b and c.