If two figures have the same shape & size,

they are congruent

 

For example

1.jpg

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Here,

  AB & PQ have

  • Same shape - both are lines
  • Same size – both are 5 cm

So, they are congruent.

 

How to check if they are congruent?

What is Congruency? - Part 2

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We rotate PQ

& superimpose it an AB

 

Since, PQ comes AB exactly…

They are congruent

 

Some common shapes that are congruent are

What is Congruency? - Part 3

 

Congruency Symbol

If two figures are congruent

What is Congruency? - Part 4

We write

  AB ≅ PQ

 

If two figures are not congruent like

 

We write,

  XY ≇ CD

What is Congruency? - Part 5

 

  1. Chapter 7 Class 9 Triangles (Term 1)
  2. Concept wise

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About the Author

Davneet Singh's photo - Teacher, Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.