https://gist.github.com/mutoo/5617691?permalink_comment_id=3174245
a very fast algorithm for getting the circumcircle from a triangle -...
a very fast algorithm for getting the circumcircle from a triangle - http://www.exaflop.org/docs/cgafaq/cga1.html#Subject 1.04 - circumcircle.js
very fastalgorithmgettingcircumcircletriangle