Journal for Geometry and Graphics 17 (2013), No. 1, 007--019
Copyright Heldermann Verlag 2013
Some Concyclicity Properties of Convex Quadrilaterals
Daniela Ferrarello
Dept. of Mathematics and Computer Science, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
Maria Flavia Mammana
Dept. of Mathematics and Computer Science, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
fmammana@dmi.unict.it
Mario Pennisi
Dept. of Mathematics and Computer Science, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
We find some concyclicity properties related to the v-parallelograms and the orthic quadrilaterals of a convex quadrilateral. In particular, we obtain a concyclicity property that allows us to define the second Droz-Farny circle for orthodiagonal quadrilaterals.
Keywords: Valtitudes, v-parallelogram, vaxes, orthic quadrilateral, Droz-Farny circles.
MSC: 51M04
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