Talk:Euler line

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How 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)

[edit] Complement?

The last paragraph says, "The Euler line is its own complement, and therefore also its own anticomplement."

What is a "complement"? What is an "anticomplement"?

Nwbeeson 20:24, 11 January 2007 (UTC)