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Problem of the Week
Problem D
The Area Within

Quadrilateral \(ABCD\) is constructed as follows:

Determine the area of \(ABCD\).

Points A, B, C, and D and lines l subscript 1 and l subscript 2 are plotted in the Cartesian plane. In quadrilateral A B C D, side A B lies on the y-axis, side A D lies on the x-axis, side C D lies on line l subscript 1 and side B C lies on line l subscript 2.