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 Post subject: rotational symmetry
PostPosted: Wed Jan 18, 2012 10:28 pm 
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Joined: Tue Jan 17, 2012 10:48 pm
Posts: 18
Maths question - how do you determine if a shape has rotational symmetry ? Any help appreciated


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 Post subject: Re: maths question
PostPosted: Wed Jan 18, 2012 10:34 pm 
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Joined: Tue Nov 23, 2010 2:15 pm
Posts: 196
Location: Birmingham
Do you remember those wooden puzzles your child did as a toddler which had various shapes with little pegs to hold them by and your child had to find out which hole the puzzle piece fitted in?

OK now picture the shape you are trying to work out the rotational symmetry for as one of those puzzle pieces. How many times could you rotate it and still fit it in the same hole? This tells you the order of rotational symmetry.

Hope this helps.


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 Post subject: Re: maths question
PostPosted: Wed Jan 18, 2012 11:05 pm 
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Thanks Poppit


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 Post subject: Re: maths question
PostPosted: Thu Jan 19, 2012 6:33 pm 
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Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11936
That's not quite right ... it's more 'How many times will it fit if I rotate it 360 degrees ie one turn?'


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 Post subject: Re: maths question
PostPosted: Thu Jan 19, 2012 9:28 pm 
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Joined: Tue Nov 23, 2010 2:15 pm
Posts: 196
Location: Birmingham
Thanks Guest55 that is what I was attempting to explain, but I didn't quite pick words.


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