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  • $\begingroup$ The package is incompatible with any recent version of Mathematica. Current support for geometric computations is radically different and much extended over the old version of Mathematica for which the package MathWorld`PlaneGeometry was written. $\endgroup$ Commented Jul 13, 2017 at 0:00
  • $\begingroup$ @m_goldberg What do you mean by "radically different and much extended"? I am still not sure why they would remove support for what seems like a set of highly useful geometric functionality (unless you are saying that such support was not in fact removed but extended...?). $\endgroup$ Commented Jul 13, 2017 at 12:47
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    $\begingroup$ If you don't have a version of Mathematica with the built-in Circumsphere[] function, see this. $\endgroup$ Commented Jul 26, 2017 at 5:30