Q13 of 113 Page 128

In Fig. 5.13, POR is a line. The value of a is

∠ POQ and ∠ QOR forms a linear pair

(3a + 5)^° + (2a-25)^° = 180^°

⇒ 5a - 20^° = 180^°

⇒ 5a = 200^°

⇒ a = 40^°

In Fig. 5.12, lines l and m intersect each other at a point. Which of the following is false?

If angle P and angle Q are supplementary and the measure of angle P is 60°, then the measure of angle Q is

In Fig. 5.14, POQ is a line. If x = 30°, then ∠QOR is

The measure of an angle which is four times its supplement is