public Sphere(Location3D centre, Plane tangent)
{
A = centre.X;
B = centre.Y;
C = centre.Z;
R = centre.DistanceTo(tangent);
}
public Sphere(Location3D centre, Location3D point)
{
A = centre.X;
B = centre.Y;
C = centre.Z;
R = centre.DistanceTo(point);
}