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Know Your 2D Shapes: Find Lines of Symmetry

In this worksheet, students will study 2D diagrams for line symmetry.

'Know Your 2D Shapes: Find Lines of Symmetry' worksheet

Key stage:  KS 1

Curriculum topic:   Geometry: Properties of Shapes

Curriculum subtopic:   Identify 2D Shapes

Difficulty level:  

Worksheet Overview

What's a line of symmetry?  Symmetry in maths means that an imaginary line can be drawn down a shape so that you can fold the image, and both halves will match exactly.

 

Symmetrical Shape

 

Look at this picture of a house. You can see that if we were to draw the exact mirror image on the blank side of the page, we'd have a beautifully drawn house!

 

Symmetrical House

 

You may want to think of symmetry as two things being exactly the same after a fold.  We think to really get to grips with symmetry, it's always worth trying it out with some paper, so you can put it into practice!

 

The other thing that you can do to help you grasp this is to use a mirror.  If you placed a mirror on its edge on the dotted line of the letter U below, and then looked in the mirror... guess what?  You'd see the whole letter U again! 

 

Can you think of any other letters of the alphabet that might be symmetrical?

 

Symmetrical Letter

 

Some shapes may have more than one line of symmetry.  If we look at the letter U above we can see that we can only fold this letter in one place for it to be identical on both sides of the fold. 

But what about the letter H below?


Letter H Symmetry

 

We'd say that this letter has two lines of symmetry.  Can you see?  There are two places where we could fold this shape to get a mirror image.
 

In this activity, you must decide whether the given road signs have line symmetry or not and how many lines of symmetry you can see. 

 

 Remember that this just means that a line can be drawn down them and you would see both halves being a mirror image of one another!

 

Are you ready to have a go?

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