Problem 636. Spherical radius given four points

 pts = [x1 y1 z1;
        x2 y2 z2;
        x3 y3 z3;
        x4 y4 z4]

 pts = [1 0 0;
        0 1 0;
        0 0 1;
       -1 0 0]
 r=1

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