Loading please wait

The smart way to improve grades

Comprehensive & curriculum aligned

Try an activity or get started for free

Identify Congruent Triangles

In this worksheet, students will identify congruent triangles and give reasons for their congruence.

'Identify Congruent Triangles ' worksheet

Key stage:  KS 3

Curriculum topic:   Geometry and Measures

Curriculum subtopic:   Apply Facts About Angles and Sides

Difficulty level:  

Worksheet Overview

Triangles which are exactly the same shape and size are congruent.

Note: this also applies to shapes other than triangles.


Triangles are congruent for the following reasons:


Three matching sides (SSS)




Two matching sides and the angle between them (SAS)




Two matching angles and a corresponding side (AAS)




In a right-angled triangle, the hypotenuse and one matching side (RHS)




Now it's over to you. You will identify congruent triangles and give reasons as to why they are in fact, congruent. 

What is EdPlace?

We're your National Curriculum aligned online education content provider helping each child succeed in English, maths and science from year 1 to GCSE. With an EdPlace account you’ll be able to track and measure progress, helping each child achieve their best. We build confidence and attainment by personalising each child’s learning at a level that suits them.

Get started

Try an activity or get started for free

  • educational
  • bettfutures
  • cxa
  • pta
  • era2016
  • BDA award
  • Explore LearningTuition Partner
  • tacm