Geodesic
Some Concyclicity Properties of Convex Quadrilaterals
Journal for geometry and graphics, Tome 17 (2013) no. 1, pp. 7-19 Cet article a éte moissonné depuis la source Heldermann Verlag

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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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     author = {D. Ferrarello and M. F. Mammana and M. Pennisi },
     title = {Some {Concyclicity} {Properties} of {Convex} {Quadrilaterals}},
     journal = {Journal for geometry and graphics},
     pages = {7--19},
     year = {2013},
     volume = {17},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/JGG_2013_17_1_JGG_2013_17_1_a1/}
}
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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/