rotational symmetry terra alta/east preston school
TRANSCRIPT
Rotational Symmetry
Terra Alta/East Preston School
Rotational SymmetryIf, when you rotate a shape, it looks exactly the same as it did in its original position, then we say that the shape has rotational symmetry.
This square has rotational symmetry.
It looks exactly the same four times in a full turn.
It has rotational symmetry order 4.
Rotational Symmetry
Does this have rotational symmetry?
It looks exactly the same twice in a full turn.
It has rotational symmetry order 2.
Yes!NoNoYes!
Click to rotate the rectangle.
Rotational Symmetry in the Alphabet
Which letters have 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 rotational symmetry?Click to see the answers.
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 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 rotational symmetry?Sort them according to their rotational symmetry.
Rotational Symmetry with 7-Pin PolygonsRotational Symmetry
Order 2Rotational Symmetry
Order 6Rotational 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 PolygonsHere 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