Four symmetry lines
Use vertical, horizontal and two diagonal lines of symmetry on the same grid.
Free maths tool
Symmetry tool
A free classroom symmetry grid for building mirror patterns and checking whether both sides match.
Mirror and draw modes
Build matched designs automatically or draw freely before checking the mirror image.
Colour grid
Paint a 12 by 12 grid with red, blue, green, yellow and purple tiles.
Check and copy
Copy a design to the mirror side or check whether the current pattern is symmetrical.
What the tool does
The symmetry tool gives teachers and students a shared grid for drawing and testing mirror patterns.
- choose vertical, horizontal or diagonal symmetry lines
- paint cells in mirror, draw or erase mode
- change colours while building a pattern
- copy one side to the matching mirror side
- check whether the design is symmetrical
How teachers use it
Open it on a classroom display when students need to see how a line of symmetry controls matching positions.
- start with a vertical line and build a simple mirror picture
- switch to a horizontal or diagonal line and ask what changes
- draw one side only, then ask students to predict the matching cells
- use check to discuss why a design is or is not symmetrical
Why it is useful
Symmetry is easier to discuss when students can point to the line, the matching cell and the movement from one side to the other.
- supports line of symmetry vocabulary
- makes reflection and matching positions visible
- works as a model before independent geometry practice
Frequently Asked Questions
Is the symmetry tool free?
Yes. Teachers, students and families can open the symmetry tool in a browser for free.
What symmetry lines are included?
The tool includes vertical, horizontal and two diagonal lines of symmetry.
Can students check their pattern?
Yes. The check button tells students whether the current grid pattern is symmetrical.
Can it copy a mirror image?
Yes. The copy mirror control copies the source side onto the matching side for the selected line of symmetry.