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In Euclidean geometry, the Droz-Farny line theorem is a property of two perpendicular lines through the orthocenter of an arbitrary triangle. Let be a triangle with vertices , , and , and let be its orthocenter (the common point of its three altitude lines. Let and be any two mutually perpendicular lines through . Let , , and be the points where intersects the side lines , , and , respectively. Similarly, let Let , , and be the points where intersects those side lines. The Droz-Farny line theorem says that the midpoints of the three segments , , and are collinear.

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  • Droz-Farny line theorem (en)
  • Stelling van Droz-Farny (nl)
  • Теорема Дроз-Фарни (ru)
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  • De stelling van Droz-Farny is een stelling uit de meetkunde, vernoemd naar de Zwitserse wiskundige (1856 - 1912). Laat L1 en L2 een tweetal lijnen zijn die elkaar loodrecht snijden in het hoogtepunt H van de driehoek ABC. We hebben nu de volgende snijpunten met de zijden van ABC: * A1 van L1 met BC, * B1 van L1 met AC, * C1 van L1 met AB, * A2 van L2 met BC, * B2 van L2 met AC en * C2 van L2 met AB. De Stelling van Droz-Farny luidt nu dat de middens A0, B0 en C0 van de lijnstukken A1A2, B1B2 resp. C1C2 collineair zijn. De lijn wordt de rechte van Droz-Farny genoemd. (nl)
  • Теорема Дроз-Фарни — это свойство двух перпендикуляров, проходящих через ортоцентр произвольного треугольника.Линия, проходящая через — прямая Дроз-Фарни. (ru)
  • In Euclidean geometry, the Droz-Farny line theorem is a property of two perpendicular lines through the orthocenter of an arbitrary triangle. Let be a triangle with vertices , , and , and let be its orthocenter (the common point of its three altitude lines. Let and be any two mutually perpendicular lines through . Let , , and be the points where intersects the side lines , , and , respectively. Similarly, let Let , , and be the points where intersects those side lines. The Droz-Farny line theorem says that the midpoints of the three segments , , and are collinear. (en)
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  • In Euclidean geometry, the Droz-Farny line theorem is a property of two perpendicular lines through the orthocenter of an arbitrary triangle. Let be a triangle with vertices , , and , and let be its orthocenter (the common point of its three altitude lines. Let and be any two mutually perpendicular lines through . Let , , and be the points where intersects the side lines , , and , respectively. Similarly, let Let , , and be the points where intersects those side lines. The Droz-Farny line theorem says that the midpoints of the three segments , , and are collinear. The theorem was stated by Arnold Droz-Farny in 1899, but it is not clear whether he had a proof. (en)
  • De stelling van Droz-Farny is een stelling uit de meetkunde, vernoemd naar de Zwitserse wiskundige (1856 - 1912). Laat L1 en L2 een tweetal lijnen zijn die elkaar loodrecht snijden in het hoogtepunt H van de driehoek ABC. We hebben nu de volgende snijpunten met de zijden van ABC: * A1 van L1 met BC, * B1 van L1 met AC, * C1 van L1 met AB, * A2 van L2 met BC, * B2 van L2 met AC en * C2 van L2 met AB. De Stelling van Droz-Farny luidt nu dat de middens A0, B0 en C0 van de lijnstukken A1A2, B1B2 resp. C1C2 collineair zijn. De lijn wordt de rechte van Droz-Farny genoemd. (nl)
  • Теорема Дроз-Фарни — это свойство двух перпендикуляров, проходящих через ортоцентр произвольного треугольника.Линия, проходящая через — прямая Дроз-Фарни. (ru)
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