http://ask.metafilter.com/tags/equilateral Questions tagged with 'equilateral' at Ask MetaFilter. Thu, 03 Mar 2005 11:11:56 -0800 Thu, 03 Mar 2005 11:11:56 -0800 en-us http://blogs.law.harvard.edu/tech/rss 60 http://ask.metafilter.com/15865/Does%2Disosceles%2Dsubsume%2Dequilateral Are equilateral triangles also isosceles? My daughter was given homework in which she had to identify isosceles triangles. We decided that given the definition "has two equal sides", an equilateral triangle must also be isosceles. Her maths teacher disagrees. It's been a long time since I did plane geometry, but I'm sure that the formal definition was not "two sides <b>only</b>"<br> I can't find authoritative, unambiguous references on Google. I'd love an online reference, but a dead-trees one would be good too.<br> <br> I'm not going to buy a fight over geometry with a hapless primary school teacher but this is driving me nuts. tag:ask.metafilter.com,2005:site.15865 Thu, 03 Mar 2005 11:11:56 -0800 equilateral geometry homework isosceles triangle i_am_joe's_spleen