Diagonal lines of symmetry
I can reflect shaded squares and polygons in a diagonal line of symmetry.
Diagonal lines of symmetry
I can reflect shaded squares and polygons in a diagonal line of symmetry.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- A line of symmetry does not have to be vertical or horizontal. You can reflect shapes in a diagonal line of symmetry.
- You can reflect a shape by counting the position of each vertex and making a mark, and then joining the marks.
- Each vertex of a shape will be the same distance from the line of symmetry when it is reflected.
Keywords
Line of symmetry - If you were to fold a shape on its line of symmetry, both halves would match exactly.
Mirror line - Mirror line is another term to describe the line of symmetry.
Reflect - When you reflect a shape, you flip it over a mirror line or line of symmetry without turning it or changing the size.
Reflection - The reflection of a shape is the mirror image of a shape.
Common misconception
Children may try to reflect in a diagonal line but not at a 45 degree angle, leading to inaccuracies when marking each vertex.
Encourage children to work horizontally and then vertically, rather than trying to reflect in a diagonal line. Explore how this can be done in either order, orienting the paper, and notice how the same point will still be marked on the grid.
Licence
Lesson video
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Starter quiz
6 Questions
triangle
kite
parallelogram
Exit quiz
6 Questions
horizontal
vertical
diagonal
kite
trapezium
rectangle
