CPCT or CPCTC

18 Feb
Math - Class 9 | NCERT, , , , , , , ,

In NCERT books for class 9 and 10, term CPCT is used while proving congruence of triangles or other shapes. Very frequently students ask me this query why I use CPCTC instead of CPCT.

The term CPCTC is more accurate and right term because when we say CPCT that means Corresponding Parts of Congruent Triangles. Now, one question that should come to your mind is –

Corresponding Parts of Congruent Triangles – are what?

And we know that the answer is very simple – CONGRUENT.

Hence, CPCTC is more accurate term which means –

Corresponding Parts of Congruent Triangles are Congruent.

Recommended - Axioms (Lines & Angles)
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Chapter 6 – Lines and Angles

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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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