Find the measure of angle 1, 3, and 4.

Answer:
1) 60
3) 120
4) 60
Step-by-step explanation:
Angle 1 is supplementary to your known angle. Therefor, Angle 1 is 180 - 120
Angle 3 is supplementary to Angle 1 and equal to 120
Angle 4 is supplementary to Angle 3 and equal to angle 1.