rotational symmetry terra alta/east preston school

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