Difference between revisions of "2003 AMC 8 Problems/Problem 21"
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Revision as of 03:37, 11 March 2012
Using the formula for the area of a trapezoid, we have . Thus . Drop perpendiculars from to and from to and let them hit at and respectively. Note that each of these perpendiculars has length . From the Pythagorean Theorem, and thus . Substituting back into our original equation we have thus