1. In the following figure, two straight lines AB and CD are intersecting each other at the point 0 and the angles thus formed at 0 are marked, then the value of ∠x - ∠y is

2. In the following figure, tell which pair of angles are not corresponding angles?

3. See the figure of Q. 32 above. Which pair of angles are alternate interior angles?

4. In the following figure, a transversal cuts two parallel lines l and m at points G and H respectively and the angles thus formed are marked. If ∠1 is an acute angle, then, which of the following statements is false?

5. In the following figure, a transversal c intersects two parallel lines a and b at A and B respectively and the angles formed at A and B are marked. Tell which of the following pairs of angles need not be equal?

6. Which of the following pairs of angles are not adjacent angles?

7. Find the measure of the angle which is double of its complementary angle?

8. Find the measure of the angle which is half of its supplementary angle?

9. In the following figure, if ∠1 + ∠3 = 120°, then ∠2 + ∠4 is equal to

10. In the following figure, if ∠1 + ∠2 = 100°, then the measure of ∠4 is equal to