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www.numeracysoftware.com Rotational Symmetry www.numeracysoftware.com Rotational Symmetry If, when you rotate a shape, it looks exactly the same as it.

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Presentation on theme: "www.numeracysoftware.com Rotational Symmetry www.numeracysoftware.com Rotational Symmetry If, when you rotate a shape, it looks exactly the same as it."— Presentation transcript:

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2 Rotational Symmetry

3 Rotational Symmetry 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. This square has got rotational symmetry. It looks exactly the same four times in a full turn. It has got rotational symmetry order 4.

4 Rotational Symmetry Does this rectangle have rotational symmetry? It looks exactly the same twice in a full turn. It has got rotational symmetry order 2. Yes, it fits!No, it doesnt fit Yes, it fits! Click to rotate the rectangle.

5 Rotational Symmetry in the Alphabet Which letters have got rotational symmetry? ABCDEFGHI JKLMNOPQR STUVWXYZ Click to see the answers. Order 2

6 Rotational Symmetry all around us Which road signs have got rotational symmetry? Click to see the answers.

7 Rotational Symmetry all around us Click to see the road signs with rotational symmetry. Order 3Order 2

8 Rotational Symmetry all around us Click to see more road signs with rotational symmetry. Order 4Order 3Order 2

9 Rotational Symmetry all around us Click to see more road signs with rotational symmetry. Order 3Order 2

10 Rotational Symmetry with Pentominoes If you dont know what a pentomino is, then click here. click here. If you have done the pentominoes activity before, then you will know what a pentomino is and how many different pentominoes there are. Here they are...

11 Rotational Symmetry with Pentominoes Which Pentominoes have got rotational symmetry? Sort them according to their rotational symmetry.

12 Rotational Symmetry with Pentominoes Rotational Symmetry Order 2 Rotational Symmetry Order 4 Click to start sorting

13 Rotational Symmetry with 7-Pin Polygons If you dont know what a 7-pin polygon is, then click here.click here. 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. Here they are...

14 Rotational Symmetry with 7-Pin Polygons Which 7-Pin Polygons have got rotational symmetry? Sort them according to their rotational symmetry.

15 Rotational Symmetry with 7-Pin Polygons Rotational Symmetry Order 2 Rotational Symmetry Order 6 Rotational Symmetry Order 3 Click to start sorting

16 Now you know all about rotational symmetry! END OF PRESENTATION

17 Pentominoes A pentomino is made out of five squares that are connected along at least one edge. These are NOT pentominoes. Here is an example of a pentomino. How many different pentominoes can you find? Click hereClick here to return to line symmetry.

18 7-Pin Polygons Here is an arrangement of 7 pins. Here are some examples of 7-pin polygons. How many different 7-pin polygons can you find? Click hereClick here to return to line symmetry. A 7-pin polygon is a closed shape with straight sides with corners on the pins.

19 END OF PRESENTATION


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