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Oct 6, 2017 at 22:09 comment added Tom Goodwillie A triangle is only called a trigon in the word "trigonometry". And a tetragon is never called that, nor is it called a quadrangle if it's a geometric rather than a geographical feature: it's a quadrilateral. Go figure.
Oct 6, 2017 at 2:36 comment added Zach Teitler The shape with three sides is called a triangle, while the shape with eight corners is called an octagon. What is the English language coming to?! :-)
Oct 1, 2012 at 22:51 comment added Todd Trimble We all do. (Well, maybe some ultrafinitists don't.)
Oct 1, 2012 at 19:16 history answered Tom Goodwillie CC BY-SA 3.0