Q80 of 113 Page 128

In Fig. 5.40, OR ⊥ OP.

(i) Name all the pairs of adjacent angles.

(ii) Name all the pairs of complementary angles.

Pairs of Adjacent angles:

i) ∠ x and ∠y

ii) ∠y and ∠z

iii) ∠x + y and ∠z

iv) ∠z + y and ∠x

Pair of complementary angle:

∠y and ∠x

In Fig. 5.38, l ||m||n.

∠QPS = 35° and ∠QRT = 55°. Find ∠PQR.

In Fig. 5.39, P, Q and R are collinear points and TQ ⊥ PR,

Name; (a) pair of complementary angles

(b) two pairs of supplementary angles.

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.

In Fig. 5.40, OR ⊥ OP.(i) Name all the pairs of adjacent angles.(ii) Name all the pairs of complementary angles.