Answer:
42
Step-by-step explanation:
Angle 1 and the angle that is 138 degrees is on the same line. A line is 180 degrees, so you subtract 138 from 180 and you get 42. I hope this helps (:
42 degrees
every line is 180 degrees, right, so you need to subtract the number you know another angle to find the missing number.
180-138
angle 1 is 42 degrees
