Vertical angles at a transversal

Parallel lines cut by a transversal make equal angles (corresponding, alternate, vertical) and angles that add to 180° (straight line, co-interior).

1. Two parallel lines are cut by a transversal. One angle measures 121°. What is the measure of an angle that is its vertical (opposite) angle?
2. Two parallel lines are cut by a transversal. One angle measures 83°. What is the measure of an angle that is its vertical (opposite) angle?
3. Two parallel lines are cut by a transversal. One angle measures 116°. What is the measure of an angle that is its vertical (opposite) angle?
4. Two parallel lines are cut by a transversal. One angle measures 63°. What is the measure of an angle that is its vertical (opposite) angle?
5. Two parallel lines are cut by a transversal. One angle measures 137°. What is the measure of an angle that is its vertical (opposite) angle?
6. Two parallel lines are cut by a transversal. One angle measures 75°. What is the measure of an angle that is its vertical (opposite) angle?
7. Two parallel lines are cut by a transversal. One angle measures 109°. What is the measure of an angle that is its vertical (opposite) angle?
8. Two parallel lines are cut by a transversal. One angle measures 51°. What is the measure of an angle that is its vertical (opposite) angle?
9. Two parallel lines are cut by a transversal. One angle measures 36°. What is the measure of an angle that is its vertical (opposite) angle?
10. Two parallel lines are cut by a transversal. One angle measures 76°. What is the measure of an angle that is its vertical (opposite) angle?
11. Two parallel lines are cut by a transversal. One angle measures 135°. What is the measure of an angle that is its vertical (opposite) angle?
12. Two parallel lines are cut by a transversal. One angle measures 85°. What is the measure of an angle that is its vertical (opposite) angle?
13. Two parallel lines are cut by a transversal. One angle measures 161°. What is the measure of an angle that is its vertical (opposite) angle?
14. Two parallel lines are cut by a transversal. One angle measures 142°. What is the measure of an angle that is its vertical (opposite) angle?
15. Two parallel lines are cut by a transversal. One angle measures 53°. What is the measure of an angle that is its vertical (opposite) angle?
16. Two parallel lines are cut by a transversal. One angle measures 126°. What is the measure of an angle that is its vertical (opposite) angle?
17. Two parallel lines are cut by a transversal. One angle measures 55°. What is the measure of an angle that is its vertical (opposite) angle?
18. Two parallel lines are cut by a transversal. One angle measures 139°. What is the measure of an angle that is its vertical (opposite) angle?
19. Two parallel lines are cut by a transversal. One angle measures 87°. What is the measure of an angle that is its vertical (opposite) angle?
20. Two parallel lines are cut by a transversal. One angle measures 103°. What is the measure of an angle that is its vertical (opposite) angle?