Finding the Centre of Rotation for 90 Degree Rotations

Pupils often find it difficult to visualise the centre of rotation for 90 degree rotations. So instead of the trial and error approach that they often employ, try this instead.

I wrote this short PowerPoint presentation to demonstrate how it works. There are 3 examples and it finally makes use of the often redundant set square!

Do let me know how it goes.

Thanks

Paul