Question -
Answer -
From figure:
∠Y =120° [Vertical opposite angles]
∠3 + ∠Y = 180° [Linear pair angles theorem]
=> ∠3= 180– 120
=> ∠3= 60°
Line l is parallel to line m,
∠1 = ∠3 [ Corresponding angles]
∠1 = 60°
Also, line m is parallel to line n,
∠2 = ∠Y [Alternate interior angles are equal]
∠2 =120°
Answer: ∠1 =60°, ∠2 =120° and ∠3 =60°.