1. No rotational Symmetry
Order 4
Order 3
Order 2

2. Order 5
Order 6
Order 3
Order 5

3. No rotational Symmetry
Order 5
Order 3
Order 6
No rotational Symmetry

4. TOP How many times does this shape fit into itself?
We say a shape has ROTATIONAL SYMMETRY if it fits exactly into itself (looks exactly THE SAME) when it is rotated.
TOP
How many times does this shape fit into itself?
We say it has rotational symmetry of order 4

5. A shape may have NO Rotational Symmetry
A shape is said to have NO Rotational Symmetry
If it fits onto itself only ONE TIME

6. The ORDER of Rotational Symmetry
The order of rotational symmetry of a shape is determined by how many times the shape fits onto itself during a 360° turn.

7. Take a whiteboard each please!
L.O. To be able to find the order of rotational symmetry of any given shape

8. Equilateral Triangle
An equilateral triangle has rotational symmetry of order ? 3 3 2 1

9. Square
A square has rotational symmetry of order ?
Square

10. Square
A square has rotational symmetry of order ?

11. Square
A square has rotational symmetry of order ? 4 3 4 2 1

12. Regular Pentagon
A regular pentagon has rotational symmetry of order ?

13. Regular Pentagon
A regular pentagon has rotational symmetry of order ? 5 5 4 1 3 2

14. Hexagon Regular Hexagon
A regular hexagon has rotational symmetry of order ?
Hexagon

15. Regular Hexagon
A regular hexagon has rotational symmetry of order ?

16. Regular Hexagon A regular hexagon has rotational symmetry of order ? 65 6 4 1 3 2

17. What did we say about lines of symmetry in regular polygons?
What did we say a Regular Polygon is?
A regular polygon is a shape which has:
All sides equal
All angles equal
Examples ?
What did we say about lines of symmetry in regular polygons?
Regular polygons have lines of symmetry equal to the number of sides/angles that they have

18. What can we also conclude?
Regular polygons have order of rotational symmetry equal to the number of sides/angles that they have.
For REGULAR POLYGONS
No. of sides
No. of angles
Lines of symmetry
Order

19. Rectangle
A rectangle has rotational symmetry of order ?
Rectangle

20. Rectangle
A rectangle has rotational symmetry of order ? 2 2 1

21. What is the order of rotational symmetry?
answer

22. What is the order of rotational symmetry?
answer

23. Isos Tri Isosceles Triangle
An isosceles triangle has rotational symmetry of order ?
Isos Tri

24. No rotational Symmetry
Isosceles Triangle
An isosceles triangle has rotational symmetry of order ? 1
No rotational Symmetry
Isos Tri

25. Scalene Tri Scalene Triangle
An scalene triangle has rotational symmetry of order ?
Scalene Tri

26. No rotational Symmetry
Scalene Triangle
An scalene triangle has rotational symmetry of order ?
No rotational Symmetry 1

27. Isos Trapezium Isosceles Trapezium
An isosceles trapezium has rotational symmetry of order ?
Isos Trapezium

28. No rotational Symmetry
Isosceles Trapezium
An isosceles trapezium has rotational symmetry of order ?
No rotational Symmetry 1

29. Trapezium
A trapezium has rotational symmetry of order ?
Trapezium

30. No rotational Symmetry
Trapezium
A trapezium has rotational symmetry of order ?
No rotational Symmetry 1

31. Kite
A kite has rotational symmetry of order ?
Kite

32. No rotational Symmetry
Kite
No rotational Symmetry
A kite has rotational symmetry of order ? 1

33. Rhombus
A rhombus has rotational symmetry of order ?
Rhombus

34. Rhombus 2
A rhombus has rotational symmetry of order ? 2 1

35. Homework
Go over PowerPoints making sure you feel confident in both line symmetry and rotational symmetry
It’s the end of symmetry topic 