Line Symmetry

A shape is said to have Line Symmetry (often called Reflection Symmetry or Mirror Symmetry) when it can folded in half so that both halves match. If a mirror is placed along the line of the fold (called the 'line of symmetry' or 'mirror line') then the shape will look the same as without the mirror.

Data                 Data

If a shape can be divided into identical mirror images by a line of symmetry it is said to be symmetrical. Lines of symmetry can be any direction and shapes can have more than one .

Examples of lines of symmetry.


Two lines of symmetry


Four lines of symmetry


No lines of symmetry


One line of symmetry


Three lines of symmetry


Six lines of symmetry


With a circle, any line that goes through the centre is a line of symmetry!

Therefore this shape has an infinite number of lines of symmetry.

Practice working with Symmetry with these
worksheets from Primary Resources

Symmetry      Shape Symmetry      

Symmetry Sheet 1        Symmetry Sheet 2

Alphabet Line Symmetry    

Reflective Symmetry

Practice symmetry with this mission from BBC Bitesize


Play Full Screen version

CAT4 / 12 Pus papers