1. Symmetry Line Symmetry Rotational (Order) Symmetry
MTH 2-19a
MTH 3-19a
Line Symmetry
Rotational (Order) Symmetry
Creating Rotational Symmetry
Translational Symmetry

2. Starter Questions www.mathsrevision.com Q1. Calculate
MTH 2-19a
MTH 3-19a
Q1. Calculate
Q2. If 1 bar of chocolate costs 65p. How much will
1000 bars cost. Give your answer in £’s.
Q3. Round to 1 decimal place
Q4. Convert to 24 hrs clock

3. Line Symmetry www.mathsrevision.com Learning Intention
MTH 2-19a
MTH 3-19a
Learning Intention
Success Criteria
To revise line symmetry.
Understand the term line symmetry.
Complete Drawings given the line of symmetry.

4. Line Symmetry www.mathsrevision.com
MTH 2-19a
MTH 3-19a
A line symmetry occurs in a shape if, when the shape is folded over the line the two pieces either side of the line, are exactly the same.

5. Line Symmetry The Square
MTH 2-19a
MTH 3-19a

6. Line Symmetry The rectangle
MTH 2-19a
MTH 3-19a

7. Line Symmetry The square
MTH 2-19a
MTH 3-19a

8. Line Symmetry The Rhombus
MTH 2-19a
MTH 3-19a

9. Line Symmetry The Parallelogram
MTH 2-19a
MTH 3-19a
No lines of symmetry !

10. Line Symmetry The Equilateral Triangle
MTH 2-19a
MTH 3-19a

11. Line Symmetry The Trapezium 1
MTH 2-19a
MTH 3-19a

12. Line Symmetry The Trapezium 2
MTH 2-19a
MTH 3-19a
No lines of symmetry !

13. Line Symmetry The Hexagonal
MTH 2-19a
MTH 3-19a

14. Line Symmetry www.mathsrevision.com
MTH 2-19a
MTH 3-19a
Example : Complete the rest of the shape given the line of symmetry.

15. Creating Half-Turn Symmetry
MTH 2-19a
MTH 3-19a
Your turn !
Exercise 1
Page 81

16. Starter Questions www.mathsrevision.com
MTH 2-19a
MTH 3-19a
Q1. Round the following to the first decimal place.
(a) (b)
Q2. What fraction is the green area.
What fraction is the grey area.
Q3. A pencil costs 22p. How much does
a 1000 cost. Put your answer in £’s.

17. Rotational Symmetry www.mathsrevision.com Learning Intention
MTH 2-19a
MTH 3-19a
Learning Intention
Success Criteria
We are learning what rotational symmetry is for a shape.
Understand the terms rotational symmetry.

18. Rotational Symmetry www.mathsrevision.com
MTH 2-19a
MTH 3-19a
1. Draw this shape into your jotter.
2. Use the tracing paper to make a copy of this shape.
3. Turn the tracing paper through 180 degrees about the dot.
This new shape has HALF - TURN symmetry
This dot is called the centre of symmetry

19. Rotation Symmetry Half Turn
MTH 2-19a
MTH 3-19a
All these shapes have order 2

20. Rotation Symmetry Order
MTH 2-19a
MTH 3-19a
The order of symmetry is the number of times a shape
looks the same in one complete turn.
Has order 2
Has order 3
Has order 4

21. Your turn ! Exercise 2 Page 82 Rotational Symmetry
MTH 2-19a
MTH 3-19a
Your turn !
Exercise 2
Page 82

22. Starter Questions www.mathsrevision.com Q1. Calculate
MTH 2-19a
MTH 3-19a
Q1. Calculate
Q2. What is the time difference between
8.15am and 1:00pm
P=20cm
Q3.
A=25cm2
5cm
Q4. Find the perimeter and area of the square.
Q5. Find the order of rotational symmetry
for the shape opposite. 5 6 1 4 3 2

23. Creating Half-Turn Symmetry
MTH 2-19a
MTH 3-19a
Learning Intention
Success Criteria
We are learning how we can create half-turn symmetry for a shape.
Understand the terms half-turn symmetry.
Draw the other half of a shape such that it has half-turn symmetry.

24. Creating Half-Turn Symmetry
MTH 2-19a
MTH 3-19a
Task 1
Draw the complete shape you get
after it has been rotated
through 180 degrees about the point.
Task 2
Do the same for this shape

25. Creating Half-Turn Symmetry
MTH 2-19a
MTH 3-19a
Task 3
Do the same for this shape
If you find it difficult to work out the new shape
1. Try tracing the shape first
2. Then rotate tracing paper 180 deg about the point.

26. Creating Half-Turn Symmetry
MTH 2-19a
MTH 3-19a
Your turn !
Exercise 3
Page 85

27. Starter Questions www.mathsrevision.com Q1. Calculate
MTH 2-19a
MTH 3-19a
Q1. Calculate
Q2. What is the time difference between
8.15am and 1:00pm
Q3.
Q4. (-2) + (-3)
Q5. How many lines of symmetry does
regular hexagon have.

28. Translational (slide) Symmetry
MTH 2-19a
MTH 3-19a
Learning Intention
Success Criteria
We are learning the meaning of Translational (slide) symmetry using tile patterns.
Understand the terms translational, slide congruent and tile.
Identify shapes that tile.
Construct a tile pattern
for shapes.

29. Translational (slide) Symmetry
MTH 2-19a
MTH 3-19a
Exactly
the same shape and size !
A shape that tiles can be completely
surrounded by congruent shapes
WITHOUT leaving any gaps.

30. Translational (slide) Symmetry
MTH 2-19a
MTH 3-19a
Is this a tile pattern ?
No because there are gaps

31. Translational (slide) Symmetry
MTH 2-19a
MTH 3-19a
Write down as many tile patterns as you can
that you see every day.

32. Translational (slide) Symmetry
MTH 2-19a
MTH 3-19a
Your turn !
Exercise 4
Page 87