Jean-Pierre Ehrmann, Constructive solution of a generalization of Steinhaus' problem on partition of a triangle,
Forum Geometricorum, 7 (2007) 187--190.

Abstract: We present a constructive solution to a generalization of Hugo Steinhaus' problem of partitioning a given triangle, by dropping perpendiculars from an interior point, into three quadrilaterals whose areas are in prescribed proportions.

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