Why should X333 be of particular interest in this context, I wonder? [Note that the long line below had 3 URL's run together!] WFL On 11/3/11, ed pegg <ed@mathpuzzle.com> wrote:
Since this has come up, here's a long time question I've had....
Take a random tetrahedron.
For a given triangle center, connect it to the opposing corner of the tetrahedron. Repeat for each face of the tetrahedron.
For which triangle centers are the 4 lines concurrent?
If X333 had that property, I suppose Y333 would be a fine name for that Tetrahedral center. Links: http://faculty.evansville.edu/ck6/encyclopedia/ETC.htmlhttp://bernard.gibert... Ed Pegg Jr _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun