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returns the squared radius of s. | ||||
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returns the squared radius of the sphere passing through p, q, r
and s. Precondition: p, q, r and s are not coplanar. | ||||
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returns the squared radius of the sphere passing through p, q and r, and whose center is in the plane defined by these three points. | ||||
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returns the squared radius of the smallest circle passing through p, and q, i.e. one fourth of the squared distance between p and q. |