Rotational Symmetry - Online Geometry Lesson

An image has Rotational Symmetry if there is a centre point around
which the object is turned a certain number of degrees and the object
still looks the same, ie it matches itself a number of times while it is being rotated.

Since this triangle will match itself 3 times as it is
rotated it is said to have rotational symmetry of Order 3.

This flower has rotational symmetry of Order 5 since it matches itself 5 times..

Since all the toppings are  placed so evenly, this pizza has rotational symmetry of Order 6.

Look carefully at the image on the left. Where is it from? Notice that it has rotational symmetry of order 2? Where could you look to see if you have any images that have rotational symmetry?

NB According to the New South Wales Mathematics Syllabus,
'... if an object only matches itself once...
it is NOT considered to have rotational symmetry.'

Challenge - How can you make a teaching aid that demonstrates rotational using paper, scissors and a thumb tack?