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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 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 rectangle have rotational symmetry?

Yes, it fits!

No, it doesnt fit

No, it doesnt fit

Yes, it fits!

Click to rotate the rectangle.

- It looks exactly the same twice in a full turn.
- It has rotational symmetry order 2.

Rotational Symmetry in the Alphabet

- Which letters have rotational symmetry?

Click to see the answers.

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

Order 2

Order 2

Order 2

Order 2

S

T

U

V

W

X

Y

Z

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 dont 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 dont 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 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.

A 7-pin polygon is a closed shape with straight

sides with corners on the 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.

END OF PRESENTATION