Institute of Mathematics, UMCS, pl.M.Curie-Sklodowskiej 1, 20-031 Lublin, Poland; e-mail: mierand@golem.umcs.lublin.pl; e-mail: mozgawa@golem.umcs.lublin.pl
Abstract: In this paper we present some geometric properties of isoptics of pairs of nested closed strictly convex curves. The theory of isoptics provides a simple geometric method to prove some generalizations of well-known integral formulas of Crofton-type.
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