Answer:
1. 51 degrees
2. 18 degrees
3. 123 degrees
4. 39 degrees
Step-by-step explanation:
angle 1 + 72 + 57 = 180 degrees
angle 2 + 72= 90 degrees
angle 3 + 57 = 180 degrees
angle 4 + 18 + 123 = 180 degrees
