1. ∠8 and ∠6 are __.

2. ∠3 and ∠7 are ___.

3. Find the missing angle.

4. These angles add to 180o because they are ______________?

5. Calculate the missing angle.

6. Which value of x will show that lines l and m are parallel?

7. Which value of x will show that line m is parallel to line r?

8. Two supplementary angles are in the ratio 2 : 4. Therefore, the measure of each angle is ______

9. If m∠7 = 60°, find the measure of ∠4.

10. Classify the pair of angles shown.