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Maths help
Posted: Sun Jan 13, 2008 1:38 pm
by asvc1297
Hi
can anyone advise where you can find out the order of rotation of a square?
tks!
Posted: Sun Jan 13, 2008 2:51 pm
by dadofkent
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.
Posted: Sun Jan 13, 2008 5:15 pm
by Guest55
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 ....
Posted: Mon Jan 14, 2008 6:48 pm
by dadofkent
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.
Posted: Mon Jan 14, 2008 7:46 pm
by Guest55
Some books say order 1 so it is confusing!