Q26 of 113 Page 128

In Fig. 5.22, the value of a is

Let the point of intersection of all the three lines be O

∠ AOF = ∠ COD = 90°

∠ BOC, ∠ COD and ∠ DOE forms a linear pair

Since ∠ COD = 90°

So ∠ BOC and ∠ DOE are complementary angles

40° + 5a = 90°

⇒ 5a = 50°

⇒ a = 10°

For Fig. 5.20, statements p and q are given below:

p : a and b are forming a linear pair.

q : a and b are forming a pair of adjacent angles.

Then,

In Fig. 5.21, ∠AOC and ∠BOC form a pair of

In Fig. 5.23, if QP || SR, the value of a is

In which of the following figures, a and b are forming a pair of adjacent angles?