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2003 AIME I Problems/Problem 12

Revision as of 20:10, 6 August 2006 by Me@home (talk | contribs) (→‎Problem)

Problem

In convex quadrilateral $ABCD, \angle A \cong \angle C, AB = CD = 180,$ and $AD \neq BC.$ The perimeter of $ABCD$ is 640. Find $\lfloor 1000 \cos A \rfloor.$ (The notation $\lfloor x \rfloor$ means the greatest integer that is less than or equal to $x.$)

Solution

See also

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