GCSE Maths - Enlargements and Scale Factors

A very useful summary page of enlargement and use of scale factors.  The guide lines in the last example should be viewed with caution however as the shape (whose position is correct) is turned upside down after an enlargement scale factor -1 so all the lines joining the corresponding points should cross through the centre of enlargement.  This enlargement is the same as a rotation of 180 degrees about the centre marked.