Explanation:
4 and 5 consecutive interior angles
5 and 11 alternate exterior angles
4 and 6 alternate interior angles
7 and 9 alternate interior angles
2 and 8 alternate exterior angles
3 and 6 consecutive interior angles
1 and 9 corresponding angles
3 and 9 alternate interior angles
6 and 12 alternate exterior angles
7 and 11 corresponding angles