Problem 636. Spherical radius given four points
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
Example:
pts = [1 0 0; 0 1 0; 0 0 1; -1 0 0] r=1
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