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 Post subject: Maths help
PostPosted: Sun Jan 13, 2008 12:38 pm 
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Joined: Mon Jul 23, 2007 2:01 pm
Posts: 4
Hi

can anyone advise where you can find out the order of rotation of a square?

tks!


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PostPosted: Sun Jan 13, 2008 1:51 pm 
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Joined: Tue Jan 01, 2008 1:05 pm
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Visualise a square. That is its first order. Rotate it about its mid-point until it arrives back at the start position. Each time it it looks the same as the start position, that is another order of rotation. Therefore, the order of rotation is 4.

I think.


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PostPosted: Sun Jan 13, 2008 4:15 pm 
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Joined: Mon Feb 12, 2007 1:21 pm
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Yes it is order 4 - you rotate 360 degrees and count the number of matches - it's a good idea to mark the start point to help you count!

A rectangle is of order 2.

A kite is order 0 or order 1 depending on the definition ....


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PostPosted: Mon Jan 14, 2008 5:48 pm 
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Joined: Tue Jan 01, 2008 1:05 pm
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http://www.bbc.co.uk/schools/ks3bitesiz ... ry_3.shtml

Above may help. I do find the rule of defining a a shape with no rotational symmetry as order 0 unhelpful. It is, in my opinion, inconsistent with the remainder of order definitions.


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PostPosted: Mon Jan 14, 2008 6:46 pm 
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Joined: Mon Feb 12, 2007 1:21 pm
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Some books say order 1 so it is confusing!


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