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PostPosted: Sat Aug 22, 2009 10:19 am 
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Joined: Sat Nov 08, 2008 4:30 pm
Posts: 33
Location: Birmingham
Please can someone tell me the order of rotational symmetry of an equilateral triangle?

The above is the question no 13 of Tuition for you 11Plus Maths Test 6. The answer given is 1. The answer explains “Although it has got 3 equal sides, a triangle will only look the same when turned through 360o and returns to its original position. Order of rotational symmetry =1â€


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PostPosted: Sat Aug 22, 2009 11:22 am 
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Joined: Fri Mar 17, 2006 5:12 pm
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Location: Birmingham
Your son is correct - see wikepadia

Quote:
An equilateral triangle is the most symmetrical triangle, having 3 lines of reflection and rotational symmetry of order 3 about its center.


I can only assume that Tution for you meant to say "Isosceles"


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PostPosted: Sat Aug 22, 2009 11:42 am 
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Joined: Tue May 05, 2009 9:26 pm
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Just spoken to DH ( who did Maths at Uni) and looked at Tutor's notes for DS1 and they confirm that your DS is correct.


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PostPosted: Sun Aug 23, 2009 12:01 am 
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Joined: Sat Nov 08, 2008 4:30 pm
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Location: Birmingham
Thank you both.

Kevin8


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