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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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