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.
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.
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.
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.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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Starter quiz
6 Questions
triangle
kite
parallelogram
Exit quiz
6 Questions
horizontal
vertical
diagonal
kite
trapezium
rectangle
