Answer:
42 degrees
Explanation:
every line is 180 degrees, right, so you need to subtract the number you know another angle to find the missing number.
180-138
42
angle 1 is 42 degrees
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 (:
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