In Euclidean geometry, the Droz-Farny line theorem is a property of two perpendicular lines through the orthocenter of an arbitrary triangle. Let T {\displaystyle...

theorem, the Droz-Farny line theorem, stated by him in 1899, without proof, in an answer to question 14111 in the journal The Educational Times. Droz-Farny...

triangle geometry. The Euler line of an isosceles triangle is perpendicular to the triangle's base. The Droz-Farny line theorem concerns a property of two...

de Longchamps point Desargues' theorem Droz-Farny line theorem Encyclopedia of Triangle Centers Equal incircles theorem Equal parallelians point Equidissection...

Goormaghtigh: a generalization of Musselman's theorem a generalization of the Droz-Farny line theorem. This disambiguation page lists mathematics articles...

the Droz–Farny line. In a convex quadrilateral ABCD whose opposite sides intersect at E and F, the midpoints of AC, BD, EF are collinear and the line through...

2012-04-08. Mammana, Maria Flavia; Micale, Biagio; Pennisi, Mario (2011), "The Droz-Farny Circles of a Convex Quadrilateral" (PDF), Forum Geometricorum, 11: 109–119...