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The Desargues Configuration

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If the three straight lines joining the corresponding vertices of two triangles ABC and DEF all meet in a point G (the perspector), then the three intersections of pairs of corresponding sides lie on a straight line PQR (the perspectrix).

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The 10 lines and 10 points of intersection of three lines at a time form what is called the Desargues configuration.

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Contributed by: Izidor Hafner (March 2011)
Open content licensed under CC BY-NC-SA

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