1. < 3 and < 4
2. < 9 and < 14
3. < 9 and < 11
4. < 1 and < 2
5. < 12 and < 16
6. < 12 and < 15
7. < 7 and < 6
8. < 7 and < 8
9. < 5 and < 6
10. < 11 and < 14
A. Adjacent angles
B. Linear pair
C. Vertical angles
D. Either A or B
