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 Post subject: Order of rotational symmetryPosted: Sat Aug 22, 2009 10:19 am

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 â€œAlthough 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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 Post subject: Posted: Sat Aug 22, 2009 11:22 am

Joined: Fri Mar 17, 2006 5:12 pm
Posts: 1328
Location: Birmingham

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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 Post subject: Posted: Sat Aug 22, 2009 11:42 am

Joined: Tue May 05, 2009 9:26 pm
Posts: 505
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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 Post subject: Order of rotational symmetryPosted: Sun Aug 23, 2009 12:01 am

Joined: Sat Nov 08, 2008 4:30 pm
Posts: 33
Location: Birmingham
Thank you both.

Kevin8

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