Each oval and a natural number n ≥ 3 generate an annulus which possesses the Poncelet's porism property. A necessary and sufficient condition of existence of circuminscribed n-gons in an annulus is given.
@article{bwmeta1.element.doi-10_2478_v10062-008-0005-3,
author = {Waldemar Cie\'slak and El\.zbieta Szczygielska},
title = {Circuminscribed polygons in a plane annulus},
journal = {Annales UMCS, Mathematica},
volume = {62},
year = {2008},
pages = {49-53},
zbl = {1187.53002},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.doi-10_2478_v10062-008-0005-3}
}
Waldemar Cieślak; Elżbieta Szczygielska. Circuminscribed polygons in a plane annulus. Annales UMCS, Mathematica, Tome 62 (2008) pp. 49-53. http://gdmltest.u-ga.fr/item/bwmeta1.element.doi-10_2478_v10062-008-0005-3/
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