Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Hey mathematicians! My name's Ms Szalek and welcome to maths. Today we're going to focus on ...

Oh it's the magic circle. Can't wait to be dazzled with a few tricks. Er…let's stick to some simple stuff for now. How about some transformations? If a shape is transformed, its appearance is changed.

Materials were written for an entire year's course in geometry in which transformations were used to develop the concepts of congruence, similarity, and symmetry, as well as being a vehicle for proof.