(i) In figure, alternate angles are equal
∴ l ॥ m
(ii) In figure, l ॥ m and t is a transversal
∴ x + 70° = 180°,
Sum of angles made by a transversal on its one side is 180°,
∴ x = 180°- 70° = 110°
(iii) In figure, x = 180° – 130° = 50°
∴ Corresponding angles are equal
∴ l ॥ m