Abstract
We give a short proof of the fact that given any two-dimensional convex disk in three-space and an orthogonal projectionC′ ofC on a plane then there is a congruent copy ofC which containsC′.
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References
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Kós, G., Törőcsik, J. Convex disks can cover their shadow. Discrete Comput Geom 5, 529–531 (1990). https://doi.org/10.1007/BF02187808
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DOI: https://doi.org/10.1007/BF02187808