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Chapter 6 Class 9 Lines and Angles

Get NCERT Solutions of all exercise questions and examples of Chapter 6 Class 9 Lines and Angles free at teachoo. Answers to each question has been solved with Video. Theorem videos are also available.


In this chapter, we will learn

  • Basic Definitions - Line, Ray, Line Segment, Angles, Types of Angles (Acute, Obtuse, Right, Straight, Reflex), Intersecting Lines, Parallel Lines
  • What is Linear Pair of Angles
  • Vertically Opposite Angles are equal
  • Angles formed by a transversal on parallel lines - Corresponding Angles, Alternate Interior Angles, Alternate Exterior Angles, Interior Angles on the same of transversal. And its properties
  • Theorem 6.6 - Lines parallel to the same line are parallel to each other
  • Angle Sum Property  of Triangle
  • Exterior Angle Property of a Triangle


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Serial order wise

  Ex 6.1
  Ex 6.2
  Ex 6.3

Concept wise