Geodesic
Some Concyclicity Properties of Convex Quadrilaterals
Journal for geometry and graphics, Tome 17 (2013) no. 1, pp. 7-19.

Voir la notice de l'article provenant de la source Heldermann Verlag

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.
Classification : 51M04
Mots-clés : Valtitudes, v-parallelogram, vaxes, orthic quadrilateral, Droz-Farny circles 
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     title = {Some {Concyclicity} {Properties} of {Convex} {Quadrilaterals}},
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D. Ferrarello; M. F. Mammana; M. Pennisi . Some Concyclicity Properties of Convex Quadrilaterals. Journal for geometry and graphics, Tome 17 (2013) no. 1, pp. 7-19. http://geodesic.mathdoc.fr/item/JGG_2013_17_1_JGG_2013_17_1_a1/