Use the diagram showing m || n, as well as the relationships between interior and exterior angles of ΔABC, to answer the questions.

Angle B is the linear pairs with 60°, so the size is 180-60=120°

Angle ABC is the linear pair with 120°, so the size is 180-120-60°

Angle A corresponds to angle 60°, so they are equal

Angle BAC is the linear pair with angle A and angle 70°, so 180-(60+70)=50°

Angle ACB is 180-(50+60) = 70°

ABC is 60

BAC is 50

ACB is 70

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