Symmetry
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Practical work - use mirrors on the edge of a pattern.
http://www.mathsnet.net/cruncher/symmetry.swf
It's not perfect because it does not allow a shape that 'straddles' the mirror.
Copy patterns etc
For rotational symmetry - again do lots of examples -
http://www.subtangent.com/maths/flash/ors.swf
http://www.mathsnet.net/cruncher/symmetry.swf
It's not perfect because it does not allow a shape that 'straddles' the mirror.
Copy patterns etc
For rotational symmetry - again do lots of examples -
http://www.subtangent.com/maths/flash/ors.swf