Determine the radius of a sphere provided four non-coplanar points on the surface of the sphere.
pts = [x1 y1 z1;
x2 y2 z2;
x3 y3 z3;
x4 y4 z4]
Hint: See http://steve.hollasch.net/cgindex/geometry/sphere4pts.html
pts = [1 0 0;
0 1 0;
0 0 1;
-1 0 0]
Which values occur exactly three times?
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