Symmetry
http://www.woodlands-junior.kent.sch.uk/maths/shapes/coordinates.html#Symmetry
Check if the letters have a reflective symmetry
http://gwydir.demon.co.uk/jo/symmetry/refsym.htm
Simple movie about the line of symmetry
http://www.learningtoday.com/player/swf/Geometry_Symmetry_L1_V1_t1a.swf
Harder movie
http://www.eduplace.com/cgi-bin/schtemplate.cgi?template=/kids/mw/help/eh_popup.thtml&grade=5&chapter=15&lesson=9&title=Symmetry&tm=tmff1509e
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