Rotational Symmetry

9,832 views

Published on

Another great powerpoint by numeracy.com

Published in: Education, Technology, Business
0 Comments
3 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
9,832
On SlideShare
0
From Embeds
0
Number of Embeds
2,451
Actions
Shares
0
Downloads
130
Comments
0
Likes
3
Embeds 0
No embeds

No notes for slide

Rotational Symmetry

  1. 1. Rotational Symmetry
  2. 2. Rotational Symmetry <ul><li>If, when you rotate a shape, it looks exactly the same as it did in its original position, then we say that the shape has got rotational symmetry . </li></ul><ul><li>This square has got rotational symmetry. </li></ul><ul><li>It looks exactly the same four times in a full turn. </li></ul><ul><li>It has got rotational symmetry order 4 . </li></ul>
  3. 3. Rotational Symmetry <ul><li>Does this rectangle have rotational symmetry? </li></ul><ul><li>It looks exactly the same twice in a full turn. </li></ul><ul><li>It has got rotational symmetry order 2 . </li></ul>Yes, it fits! No, it doesn’t fit No, it doesn’t fit Yes, it fits! Click to rotate the rectangle.
  4. 4. Rotational Symmetry in the Alphabet <ul><li>Which letters have got rotational symmetry? </li></ul>A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Click to see the answers. Order 2 Order 2 Order 2 Order 2 Order 2 Order 2 Order 2
  5. 5. Rotational Symmetry all around us <ul><li>Which road signs have got rotational symmetry? </li></ul>Click to see the answers.
  6. 6. Rotational Symmetry all around us <ul><li>Click to see the road signs with rotational symmetry. </li></ul>Order 3 Order 2 Order 2
  7. 7. Rotational Symmetry all around us <ul><li>Click to see more road signs with rotational symmetry. </li></ul>Order 4 Order 3 Order 2
  8. 8. Rotational Symmetry all around us <ul><li>Click to see more road signs with rotational symmetry. </li></ul>Order 3 Order 2
  9. 9. Rotational Symmetry with Pentominoes <ul><li>If you don’t know what a pentomino is, then click here. </li></ul><ul><li>If you have done the pentominoes activity before, then you will know what a pentomino is and how many different pentominoes there are. </li></ul><ul><li>Here they are ... </li></ul>
  10. 10. Rotational Symmetry with Pentominoes <ul><li>Which Pentominoes have got rotational symmetry? </li></ul><ul><li>Sort them according to their rotational symmetry. </li></ul>
  11. 11. Rotational Symmetry with Pentominoes Rotational Symmetry Order 2 Rotational Symmetry Order 4 Click to start sorting
  12. 12. Rotational Symmetry with 7-Pin Polygons <ul><li>If you don’t know what a 7-pin polygon is, then click here. </li></ul><ul><li>If you have done the 7-pin polygons activity before, then you will know what a 7-pin polygon is and how many different ones there are. </li></ul><ul><li>Here they are ... </li></ul>
  13. 13. Rotational Symmetry with 7-Pin Polygons <ul><li>Which 7-Pin Polygons have got rotational symmetry? </li></ul><ul><li>Sort them according to their rotational symmetry. </li></ul>
  14. 14. Rotational Symmetry with 7-Pin Polygons Rotational Symmetry Order 2 Rotational Symmetry Order 6 Rotational Symmetry Order 3 Click to start sorting
  15. 15. Now you know all about rotational symmetry! END OF PRESENTATION
  16. 16. Pentominoes <ul><li>A pentomino is made out of five squares that are connected along at least one edge. </li></ul>These are NOT pentominoes. Here is an example of a pentomino. How many different pentominoes can you find? Click here to return to line symmetry.
  17. 17. 7-Pin Polygons <ul><li>Here is an arrangement of 7 pins. </li></ul>Here are some examples of 7-pin polygons. How many different 7-pin polygons can you find? Click here to return to line symmetry. A 7-pin polygon is a closed shape with straight sides with corners on the pins.
  18. 18. END OF PRESENTATION

×