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Rotational Symmetry

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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