2. welcome to The world of technology ______________________________ In MATHEMATICS

4. Rotational Symmetry © 2007 All rights reserved 5 7 2 1

5. Rotational Symmetry All 2 dimensional shapes have some rotational symmetry. The degree of rotational symmetry that an object has is known as its order. Order 1 Order 2 Order 3 Order 4 For shapes that have “order 2” rotational symmetry or higher, a single centre of rotation can be located. For shapes that have only “order 1” rotational symmetry a centre of rotation can be found anywhere within it.

6. Rotational Symmetry The order of rotational symmetry that an object has is the number of times that it fits on to itself during a full rotation of 360 0 Order 1

7. Rotational Symmetry Order 1 1 2 Order 2 The order of rotational symmetry that an object has is the number of times that it fits on to itself during a full rotation of 360 0

8. Rotational Symmetry Order 1 1 2 Order 2 1 2 3 Order 3 The order of rotational symmetry that an object has is the number of times that it fits on to itself during a full rotation of 360 0

9. Rotational Symmetry Order 1 1 2 Order 2 1 2 3 Order 3 1 2 3 4 Order 4 The order of rotational symmetry that an object has is the number of times that it fits on to itself during a full rotation of 360 0.

10. What is the order of rotational symmetry of the shape below? Rotational Symmetry

11. 1 2 3 4 5 What is the order of rotational symmetry of the shape below? Order 5 Rotational Symmetry

12. What is the order of rotational symmetry of the shape below? Rotational Symmetry

13. 1 2 3 4 5 What is the order of rotational symmetry of the shape below? Order 6 Rotational Symmetry 6

14. Equilateral Triangle An equilateral triangle has rotational symmetry of order ?

15. Equilateral Triangle An equilateral triangle has rotational symmetry of order ?

16. Equilateral Triangle An equilateral triangle has rotational symmetry of order ? 12 3 3

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

18. A square has rotational symmetry of order ?

19. Square A square has rotational symmetry of order ? 12 3 4 4

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

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

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

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

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

25. 1 2 3 4 5 6 Regular Hexagon A regular hexagon has rotational symmetry of order ? 6

26. Regular Octagon A regular octagon has rotational symmetry of order ? Octagon

27. 1 2 3 4 5 6 Regular Octagon A regular octagon has rotational symmetry of order ? 8 7 8

28. Rectangle A rectangle has rotational symmetry of order ?

29. 2 1 2 Rectangle A rectangle has rotational symmetry of order ?

30. Parallelogram A parallelogram has rotational symmetry of order ?

31. 2 1 2 Parallelogram A parallelogram has rotational symmetry of order ?

32. Isosceles Triangle An isosceles triangle has rotational symmetry of order ?

33. 1 1 Isosceles Triangle An isosceles triangle has rotational symmetry of order ?

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

35. 1 1 Scalene Triangle An scalene triangle has rotational symmetry of order ?

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

37. 1 1 Isosceles Trapezium An isosceles trapezium has rotational symmetry of order ?

38. Trapezium A trapezium has rotational symmetry of order ?

39. 1 1 Trapezium

40. A kite has rotational symmetry of order ? Kite

41. 1 1 A kite has rotational symmetry of order ? Kite

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

43. 2 1 A rhombus has rotational symmetry of order ? Rhombus 2

44. Ellipse An ellipse has rotational symmetry of order ? Ellipse

45. 2 1 An ellipse has rotational symmetry of order ? Ellipse 2

46. Rotational Symmetry State the order of rotational symmetry for each shape below: 1 2 3 4 5 6 7 8 9 10 11 12 Order 6 Order 2 Order 3 Order 2 Order 1 Order 3 Order 2 Order 5 Order 4 Order 1 Order 6 Order 8

47. Rotational Symmetry State the order of rotational symmetry for each shape below: 13 14 15 16 17 18 19 20 21 22 23 24 Order 4 Order 1 Order 2 Order 5 Order 2 Order 4 Order 6 Order 3 Order 5 Order 4 Order 3 Order 1

48. Now..it’s the time for… Now..it’s the time for… To ignite your minds.. To ignite your minds..

49. @ First, Observe the given Picture carefully. @ Try to Imagine the rotation @ Concentrate on the inner designs also @ Each question carries ‘1m’ as usual @ Time limit for each Work sheet is ‘5 min.,’ only # WRITE ONLY THE ORDER OF ROTATIONAL SYMMETRY IN THE GIVEN BOXES

50. Worksheet 1 Rotational Symmetry State the order of rotational symmetry for each shape below: 1 2 34 56 7 8 9 10

51. Worksheet 2 Rotational Symmetry State the order of rotational symmetry for each shape below: 13 14 15 16 17 18 1920 11 12

52. Credits & Acknowledges ! The master trainer. Mr. N. Uma Srinivas MS Office MS Encarta www.whiteboardmath.com www.teachingideas.com www.pppst.com Perspector panel VIPS Knowledge Centre.