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From: "Ste[hen Gray" <stevebg@roadrunner.com>
Newsgroups: comp.soft-sys.math.mathematica
Subject: Cirlce in 3D?
Date: Mon, 12 May 2014 04:43:01 +0000 (UTC)
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Xref: csiph.com comp.soft-sys.math.mathematica:16931

I'm looking for a neat formula to find the center of a circle in 3D 
through 3 points. I also need a good way to display it, preferably 
thickened so I can show several and see whether they are linked, etc. To 
my surprise I did not find anything on the Wolfram sites about these 
problems. (I have Mathematica 7, if that matters.)