AMC 10 Step by Step
2008 AMC 10AProblem 21P21-25~5 minPrint

A cube with side length 11 is sliced by a plane that passes through two diagonally opposite vertices AA and CC and the midpoints BB and DD of two opposite edges not containing AA or CC , as shown. What is the area of quadrilateral ABCDABCD ?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.