Problem
of the
Week

PROBLEM 251

Note: The first version of this problem contained some regretably confusing language. I hope this is clearer -- and correct!

This problem follows up on Problem 247, where the diagram on the left appears.  The question there was to find the area of the quadrilateral abst.  Almost all solvers assumed that the quadrilateral was a parallelogram, and therefore a rectangle. This week, the question is: Is it indeed a parallelogram?

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ã2006 Alberto L. Delgado