Pls help 25 points plsssss

Identify the angle pair relationship


Angle 7 and 13
Angle 6 and 4
Angle 1 and 15
Angle 10 and 16
Angle 5 and 6
Angle 3 and 12
Angle 1 and 10
Angle 9 and 13
Angle 4 and 2
Angle 8 and 16