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| compares the squared radius of the sphere of radius 0 centered at p to sr. This returns the opposite sign of sr. | ||||
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| compares the squared radius of the sphere defined by the points p and q to sr. | ||||
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| compares the squared radius of the sphere defined by the points p, q, and r to sr. | ||||
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| compares the squared radius of the sphere defined by the points p, q, r, and r to sr. | ||||