Reflect polygons in a line of symmetry | Maths | Quizalize & Oak National Academy

Starter quiz

Which of these shapes are regular polygons?
- Equilateral triangle ✓
- Rectangle
- Square ✓
- Trapezium
An equilateral triangle has ___ lines of symmetry.
- 0
- 1
- 2
- 3 ✓
This shape is a regular pentagon. It has ______ lines of symmetry.
- '5' ✓
The number of lines of symmetry in a __________ is equal to the number of sides.
- quadrilateral
- triangle
- regular polygon ✓
True or false. An isosceles triangle has 3 lines of symmetry.
- True
- False ✓
Which statement is true?
- Squares and rectangles both have 4 lines of symmetry.
- A rectangle has more lines of symmetry than a square.
- A square has 4 lines of symmetry, and a rectangle has 2 lines of symmetry. ✓
- Squares and rectangles are both regular polygons.

The mirror image of a shape is a __________ of it.
- reflection ✓
- larger shape
- smaller shape
Which image shows a reflection?
- a)
- b) ✓
- c)
True or false. This image shows a reflection.
- True
- False ✓
Which image shows a reflection?
- a) ✓
- b)
- c)
Sam is using vertices to reflect this shape. Which vertex has been placed in the wrong position on the grid?
- a)
- b) ✓
- c)
Complete the sentence. This image does not show a reflection because __________.
- The 'reflected' shape is a different size.
- The 'reflected' shape is not the same distance from the mirror line. ✓
- The 'reflected' shape has not been flipped.

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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.

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.

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.