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# Rotational Symmetry

## by JC Sawyer Dolphins on Feb 28, 2010

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Another great powerpoint by numeracy.com

Another great powerpoint by numeracy.com

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## Rotational SymmetryPresentation Transcript

• Rotational Symmetry
• 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 .
• 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 doesn’t fit No, it doesn’t fit Yes, it fits! Click to rotate the rectangle.
• Rotational Symmetry in the Alphabet
• Which letters have got rotational symmetry?
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
• Rotational Symmetry all around us
• Which road signs have got rotational symmetry?
• Rotational Symmetry all around us
• Click to see the road signs with rotational symmetry.
Order 3 Order 2 Order 2
• Rotational Symmetry all around us
• Click to see more road signs with rotational symmetry.
Order 4 Order 3 Order 2
• Rotational Symmetry all around us
• Click to see more road signs with rotational symmetry.
Order 3 Order 2
• Rotational Symmetry with Pentominoes
• If you don’t know what a pentomino is, then 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 ...
• Rotational Symmetry with Pentominoes
• Which Pentominoes have got rotational symmetry?
• Sort them according to their rotational symmetry.
• Rotational Symmetry with Pentominoes Rotational Symmetry Order 2 Rotational Symmetry Order 4 Click to start sorting
• Rotational Symmetry with 7-Pin Polygons
• If you don’t know what a 7-pin polygon is, then 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 ...
• Rotational Symmetry with 7-Pin Polygons
• Which 7-Pin Polygons have got rotational symmetry?
• Sort them according to their rotational symmetry.
• Rotational Symmetry with 7-Pin Polygons Rotational Symmetry Order 2 Rotational Symmetry Order 6 Rotational Symmetry Order 3 Click to start sorting
• Now you know all about rotational symmetry! END OF PRESENTATION
• 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 here to return to line symmetry.
• 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 here to return to line symmetry. A 7-pin polygon is a closed shape with straight sides with corners on the pins.
• END OF PRESENTATION