Answer:
40°
Step-by-step explanation:
The total angles of all triangles is 180°, so you need to subtract the given angles from 180 to get your missing angle.
180 - 57 = 123 - 83 = 40
Answer: x=40
All angles in a triangle add up to 180 degrees.
The two other angles on their own are 57 and 83 = 140
180-140=40
x = 40 degrees
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