Angle pairs, unit test

1. Vertical angles are angle pairs that are opposite each other when two lines intersect.

- Test case: Given two intersecting lines with vertical angles measuring 60 degrees and 120 degrees. The angle pair is 60 degrees and 120 degrees.
2. Supplementary angles are angle pairs that add up to 180 degrees.
- Test case: Given two supplementary angles measuring 100 degrees and 80 degrees. The angle pair adds up to 180 degrees.
3. Complementary angles are angle pairs that add up to 90 degrees.
- Test case: Given two complementary angles measuring 30 degrees and 60 degrees. The angle pair adds up to 90 degrees.
4. Adjacent angles are angle pairs that share a common side and vertex.
- Test case: Given two adjacent angles measuring 40 degrees and 50 degrees, sharing a common side and vertex.