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find point so that area inside a trapezium is largest

Source: Nordic Mathematical Contest 1991 #2

October 5, 2017
geometrytrapezoidarea of a triangle

Problem Statement

In the trapezium ABCDABCD the sides ABAB and CDCD are parallel, and EE is a fixed point on the side ABAB. Determine the point FF on the side CDCD so that the area of the intersection of the triangles ABFABF and CDECDE is as large as possible.