Answer:
Relationship between 6 and 4: opposite exterior angles
Relationship between 6 and 2: corresponding angles
Relationship between 5 and 7: Vertical Angles
Relationship between 19 and 17: Opposite interior agles
Relationship between 9 and 11: Vertical Angles
Relationship between 21 and 15: Opposite exterior angles
Relationship between 17 and 14: Supplementary Angles
Relationship between 3 and 8: Supplementary Angles
Step-by-step explanation: