Beiträge zur Algebra und Geometrie Contributions to Algebra and Geometry Vol. 49, No. 1, pp. 205215 (2008) 

A Note on SecantopticsMagdalena SkrzypiecInstitute of Mathematics, UMCSpl. M. CurieSk{\l}odowskiej 1, 20031 Lublin, Poland email: mskrzypiec@hektor.umcs.lublin.pl Abstract: In this paper we define a certain generalization of isoptic curves. We call the new curves secantoptics, since we use secants to construct them. We extend to secantoptics some properties of isoptics known from [B] and [C]. At the end we discuss other generalizations of isoptics and relations between them. \item[C] Cie\'slak, W.; Miernowski, A.; Mozgawa, W.: Isoptics of a closed strictly convex curve. Global differential geometry and global analysis (Berlin 1990), 2835, Lect. Notes Math. {\bf 1481}, 2835. Springer, Berlin 1991. \item[B] Benko, K.; Cie\'slak, W.; Gó\'zd\'z, S.; Mozgawa, W.: On isoptic curves. An. Stiint. Univ. Al. I. Cuza Iasi Sect. I a Mat. {\bf 36}(1) (1990), 4754. Keywords: secantoptic, isoptic, secant Classification (MSC2000): 53A04, 53C44 Full text of the article:
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