Find lines of symmetry in 2D shapes
I can find lines of symmetry in 2D shapes and explain the link between lines of symmetry and number of sides in regular polygons.
Find lines of symmetry in 2D shapes
I can find lines of symmetry in 2D shapes and explain the link between lines of symmetry and number of sides in regular polygons.
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Lesson details
Key learning points
- A line of symmetry splits the shape into two equal parts which are mirror images.
- Shapes are symmetrical when they look the same when a mirror is placed on the mirror line.
- Regular polygons have the same number of lines of symmetry as they have sides.
Keywords
Symmetrical - When a shape, pattern or image has one half that is the reflection of the other half, it can be described as symmetrical.
Line of symmetry - If you were to fold a shape on its line of symmetry, both halves would match exactly.
Regular polygon - A regular polygon has sides that are all equal and angles that are all equal.
Common misconception
Children may not identify lines of symmetry that are neither horizontal nor vertical.
Allow opportunities for children to handle and manipulate cut outs of shapes so that they can try to find lines of symmetry in different orientations. Encourage them to describe the position of the line of symmetry to support their understanding.
To help you plan your year 4 maths lesson on: Find lines of symmetry in 2D shapes, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 4 maths lesson on: Find lines of symmetry in 2D shapes, 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.
Licence
Lesson video
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Starter quiz
6 Questions
Exit quiz
6 Questions
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4
4 lines of symmetry
3 lines of symmetry
5 lines of symmetry
8 lines of symmetry
6 lines of symmetry