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Subject Item
dbr:Poncelet_point
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Точка Понселе Poncelet point
rdfs:comment
Точка Понселе — предмет следующей теоремы: In geometry, the Poncelet point of four given points is defined as follows: Let A, B, C, and D be four points in the plane that do not form an orthocentric system. The nine-point circles of triangles ABC, BCD, CDA, DAB meet at one point, the Poncelet point of the points A, B, C, and D. If A, B, C, and D be four points in the plane that form an orthocentric system then triangles ABC, BCD, CDA, DAB all share the same nine-point circle.
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dbc:Euclidean_plane_geometry
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