Answer:
110°
Step-by-step explanation:
Find the other side of 140
180 - 140 = 40
So the other side of 140° is 40°
Now use this equation
180 - (30 + 40)
Where 180 is the whole degree that the angles of a triangle should add up to, 30 is what we already know and 40 is the one we just found. Add 30 and 40 and subtract that sum by 180
180 - (30 + 40)
180 - 70
110
The missing angle is 110°
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