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.
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.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Which of these shapes are regular polygons?
Q2.An equilateral triangle has ___ lines of symmetry.
Q3.This shape is a regular pentagon. It has lines of symmetry.
Q4.The number of lines of symmetry in a __________ is equal to the number of sides.
Q5.True or false. An isosceles triangle has 3 lines of symmetry.
Q6.Which statement is true?
Assessment exit quiz
6 Questions
Q1.The mirror image of a shape is a __________ of it.
Q2.Which image shows a reflection?
Q3.True or false. This image shows a reflection.
Q4.Which image shows a reflection?
Q5.Sam is using vertices to reflect this shape. Which vertex has been placed in the wrong position on the grid?
Q6.Complete the sentence. This image does not show a reflection because __________.
