Class 9 | Chapter 6 | Lines and Angles | Theorem 6.1 | Vertically opposite angles theorem

09 Aug
Class 9 - Lines & Angles, , , , , ,

Theorem 6.1: If two lines intersect each other, then the vertically opposite angles are equal.

Prerequisite

This is one of the most used theorems in geometry and one of the most easiest one to prove as well. All you need to know before you prove this theorem is knowledge of different types of angles. You may watch the following video to know about the angles in detail.

Complementary and Supplementary angles

 

Different types of angles

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Theorem 6.2

Chapter 6 – Lines and Angles

Mathemafia Logo - 75 px=> Axioms – Lines and Angles

This playlist covers all the questions, concepts, theorems and examples of chapter 6 (Lines and Angles) of class 9, NCERT textbook. Click a thumbnail to watch the tutorial. 

Watch complete chapter on YouTube
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Theorems

Theorem 6.1

Theorem 6.2

Theorem 6.3

Theorem 6.4

Theorem 6.5

Theorem 6.6

Theorem 6.7

Theorem 6.8

Exercise 6.1

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Exercise 6.2

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Exercise 6.3

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Examples

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

Example 7

Example 8

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