Starter quiz
- Which of these shapes are regular polygons?
- Equilateral triangle ✓
- Rectangle
- Square ✓
- Trapezium
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- 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.
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Exit quiz
- 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)
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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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Worksheet
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Presentation
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Video
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.
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.
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.
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