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compute the center of the sphere passing through the points p, q, r,
and s. Precondition: p, q, r, and s are not coplanar. | ||||
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compute the center of the sphere passing through the vertices of t. Precondition: t is not degenerate. | ||||
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compute the center of the circle passing through the points p, q and r. Precondition: p, q and r are not collinear. | ||||
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compute the center of the circle passing through the vertices of t. Precondition: t is not degenerate. |