Answer:
∠ ACD = 130°
Step-by-step explanation:
∠ ABC = 180° - 120° = 60° ( adjacent angles on a straight line )
The exterior angle of a triangle is equal to the sum of the 2 opposite interior angles.
∠ ACD is an exterior angle of the triangle , then
∠ ACD = 70° + 60° = 130°
