Class 9 | Chapter 7 | Triangles | Theorem 7.2 | Isosceles triangle theorem

13 Aug
Class 9 - Triangles, , , , , ,

Theorem 7.2: Angles opposite to equal sides of an isosceles triangle are equal.

Theorem 7.1
Theorem 7.3

Prerequisite

It is quite easy to prove this theorem and it’s been proved by two different ways in the above tutorial:

  • Using angle bisector
  • Using median

You must be aware of the basic congruence postulates (axioms) that are required to prove this theorem. Following is a very important conceptual video that you must watch to better understand the proof of this theorem.

Congruence v/s Similarity – Explanation of difference between Congruent v/s Similar with examples.

Chapter 7 – Triangles

This playlist covers all the questions, concepts, theorems and examples of chapter 7 (Triangles) of class 9, NCERT textbook. Click a thumbnail to watch the tutorial. 

Watch complete chapter on YouTube
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Theorems

Theorem 7.1

Theorem 7.2

Theorem 7.3

Theorem 7.4

Theorem 7.5

Theorem 7.6

Theorem 7.7

Theorem 7.8

Exercise 7.1

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Exercise 7.2

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Exercise 7.3

Question 1

Question 2

Question 3

Question 4

Question 5

Exercise 7.4

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

Example 9

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