http://www.linkslearning.org/Kids/1_Math/2_Illustrated_Lessons/4_Line_Symmetry/index.html
http://www.bbc.co.uk/schools/ks2bitesize/maths/shape_space/transformation/play.shtml
http://www.bbc.co.uk/schools/ks2bitesize/maths/shape_space/transformation/read1.shtml


