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Nine-point circle
editHow can Euler have proved that these four points lie on the same line if the 9 point circle wasn't discovered until Feuberbach?--345Kai 12:40, 30 March 2006 (UTC)
- You're right, it seems he didn't prove it as he only defines points O, G, H and I in his article. I fixed the article. --Shenanenigans (talk) 19:47, 20 December 2010 (UTC)
Complement?
editThe last paragraph says, "The Euler line is its own complement, and therefore also its own anticomplement."
What is a "complement"? What is an "anticomplement"?
Mistake in diagram
editThe attached diagram has a mistake. On the left side of the triangle, the square "right angle" indicator is attached to the orange median, rather than the green line that helps define the circumcenter. Since the circumcenter lines are defined to be at right angles to the side, and in general the median can make any angle with the side (and certainly does not make a right angle with the side in this diagram), the right angle indicator should be attached to the green line instead. — Preceding unsigned comment added by 76.0.58.125 (talk) 20:43, 6 November 2013 (UTC)
- Thanks for catching that! It is a small mistake, with the black edge of the square extended only slightly too far, but it would be nice to have it corrected. I looked on the page that the image is linked from, and it appears that only one person who has ever contributed to the diagram is still on Wikipedia. I've left him a message asking him to read your post here. Duoduoduo (talk) 21:33, 6 November 2013 (UTC)