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An image has Rotational
Symmetry if there is a centre
point around
which the object is turned a certain number of degrees and
the object
still looks the same, ie it matches itself a number of times
while it is being rotated.
Since
this triangle will match itself
3
times as it is
rotated it is said to have rotational symmetry of
Order 3.
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This flower has rotational
symmetry of
Order
5 since it matches
itself 5
times..
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Since
all the toppings are placed
so evenly, this pizza has rotational symmetry of
Order
6.
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Look
carefully at the image on the left. Where is it from?
Notice
that it has rotational symmetry of order 2?
Where
could you look to see if you have any images that
have rotational symmetry?
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NB
According to some Math Syllabuses,
'... if an object only matches itself once...
it is
considered to have rotational symmetry.'
Challenge
- Make a teaching aid to demonstrate rotational symmetry using
paper, scissors and a thumb tack?
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Try
these ideas as a Math Tutorial or a Homework Helper
