Consecutive angles of a parallelogram are supplementary, therefore:
Angle 3 + 110° = 180°
Subtract 110° from both sides of the equation
Angle 3 + 110° – 110° = 180° – 110°
Angle 3 = 70°
Opposite angles of a parallelogram are congruent, therefore:
Angle 2 = 110°
Angle 1 = Angle 3
Since Angle 3 = 70°
Angle 1 = 70°
Summarily,
Angle 1 = 70°
Angle 2 = 110°
Angle 3 = 70°