Abstract
We prove that there are at most eight lines tangent to four unit spheres in ℝ3 if the centres of the spheres are coplanar, but not collinear. This bound is sharp.
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Received October 9, 2000, and in revised form April 26, 2001. Online publication October 12, 2001.
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Megyesi, G. Lines Tangent to Four Unit Spheres with Coplanar Centres. Discrete Comput Geom 26, 493–497 (2001). https://doi.org/10.1007/s00454-001-0046-7
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DOI: https://doi.org/10.1007/s00454-001-0046-7