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Rotations Are Not Single Round Here
Age 14 to 16
Challenge Level 
Draw a strip which does have two different centres for rotation
symmetry.
Choose a particular point within the unit shape and mark that point on each unit along your strip.
Now look where that chosen point rotates to around the first centre and where it rotates to around the second centre.
Choose a particular point within the unit shape and mark that point on each unit along your strip.
Now look where that chosen point rotates to around the first centre and where it rotates to around the second centre.
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