Answer:
∡3 = 142°
Step-by-step explanation:
28° + 10° + ∡3 = 180° (Sum of angles in a triangle)
38° + ∡3 = 180°
∡3 = 180° - 38°
Alternate method:
38° + ∡3 = 180° (Sum of angles on a straight line)
38 degree + 180 degree = [ sum of angle on a straight line]
3= 180 degree - 38 degree
3= 142 degree.
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