Reflect polygons in a line of symmetry
I can reflect polygons in a line of symmetry, including when there are no sides parallel to the line of symmetry.
Reflect polygons in a line of symmetry
I can reflect polygons in a line of symmetry, including when there are no sides parallel to the line of symmetry.
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Lesson details
Key learning points
- When you reflect a shape, it will be the same distance from the mirror line on both sides.
- You can reflect a shape by counting the position of each vertex and making a mark, and then joining the marks.
Keywords
Line of symmetry - If you were to fold a shape on its line of symmetry, both halves would match exactly.
Mirror line - Another term for a line of symmetry. If you were to fold a shape on its line of symmetry, both halves would match exactly.
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 mirror image of a shape.
Common misconception
Children may translate or copy a shape rather than 'flipping it' over the line of symmetry.
Use mirrors to support children's understanding of how a shape flips when it is reflected. Explore this idea with a wide variety of shapes.
To help you plan your year 4 maths lesson on: Reflect polygons in a line of symmetry, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 4 maths lesson on: Reflect polygons in a line of symmetry, download all teaching resources for free and adapt to suit your pupils' needs.
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Explore more key stage 2 maths lessons from the Properties of 2D and 3D shapes and symmetry unit, dive into the full secondary maths curriculum, or learn more about lesson planning.
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Starter quiz
6 Questions
Exit quiz
6 Questions
