If two figures have the same shape & size,

they are congruent

 

For example

1.jpg

 

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?

2.jpg

We rotate PQ

& superimpose it an AB

 

Since, PQ comes AB exactly…

They are congruent

 

Some common shapes that are congruent are

3.jpg

 

Congruency Symbol

If two figures are congruent

4.jpg

We write

  AB ≅ PQ

 

If two figures are not congruent like

 

We write,

  XY ≇ CD

5.jpg

 

  1. Chapter 7 Class 7 Congruence of Triangles
  2. Concept wise
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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.