(i) Given, l||m and t is transversal line.
∴ Interior vertically opposite angle between lines l and t = 110°
∴ 110° + x = 180° [Supplementary angles]
⇒ x = 180° – 110° = 70°

(ii) Given, l||m and t is transversal line.
x + 2x = [Interior opposite angles]
⇒ 3x = 180°
⇒ x= 180°/3 = 60°

(iii) Given, l||m and a||b.
x=100° [Corresponding angles]

Class 7 Maths Chapter 5 Exercise 5.2

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https://www.tiwariacademy.com/ncert-solutions/class-7/maths/chapter-5/