Vertical angles

Vertical angles are opposite each other where two lines cross, and they are equal.

1. Two straight lines cross. One of the angles measures 109°. How many degrees is the angle directly opposite it (the vertical angle)?
2. Two straight lines cross. One of the angles measures 105°. How many degrees is the angle directly opposite it (the vertical angle)?
3. Two straight lines cross. One of the angles measures 90°. How many degrees is the angle directly opposite it (the vertical angle)?
4. Two straight lines cross. One of the angles measures 124°. How many degrees is the angle directly opposite it (the vertical angle)?
5. Two straight lines cross. One of the angles measures 28°. How many degrees is the angle directly opposite it (the vertical angle)?
6. Two straight lines cross. One of the angles measures 8°. How many degrees is the angle directly opposite it (the vertical angle)?
7. Two straight lines cross. One of the angles measures 165°. How many degrees is the angle directly opposite it (the vertical angle)?
8. Two straight lines cross. One of the angles measures 43°. How many degrees is the angle directly opposite it (the vertical angle)?
9. Two straight lines cross. One of the angles measures 82°. How many degrees is the angle directly opposite it (the vertical angle)?
10. Two straight lines cross. One of the angles measures 94°. How many degrees is the angle directly opposite it (the vertical angle)?
11. Two straight lines cross. One of the angles measures 35.5°. How many degrees is the angle directly opposite it (the vertical angle)?
12. Two straight lines cross. One of the angles measures 11.5°. How many degrees is the angle directly opposite it (the vertical angle)?
13. Two straight lines cross. One of the angles measures 146.5°. How many degrees is the angle directly opposite it (the vertical angle)?
14. Two straight lines cross. One of the angles measures 46.5°. How many degrees is the angle directly opposite it (the vertical angle)?
15. Two straight lines cross. One of the angles measures 5.5°. How many degrees is the angle directly opposite it (the vertical angle)?
16. Two straight lines cross. One of the angles measures 52.5°. How many degrees is the angle directly opposite it (the vertical angle)?
17. Two straight lines cross. One of the angles measures 4.5°. How many degrees is the angle directly opposite it (the vertical angle)?
18. Two straight lines cross. One of the angles measures 123.5°. How many degrees is the angle directly opposite it (the vertical angle)?
19. Two straight lines cross. One of the angles measures 160.5°. How many degrees is the angle directly opposite it (the vertical angle)?
20. Two straight lines cross. One of the angles measures 41°. How many degrees is the angle directly opposite it (the vertical angle)?