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On rotations of geometrical. (English)
Obz. mat. fyz. inform. 43, No. 3, 21-24 (2014).
Summary: The paper presents some original solutions to a certain problem on rolling coins (circles) derived from a book by {\it D. G. Wells} [The Penguin book of curious and interesting puzzles. New York, NY: Penguin Books (1992; Zbl 0925.00013)], and also proposes several generalizations of the problem.
Classification: A20 A80
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