AMC 10 Step by Step
2009 AMC 10BProblem 4P1-10~2 minPrint

A rectangular yard contains two flower beds in the shape of congruent isosceles right triangles. The remainder of the yard has a trapezoidal shape, as shown. The parallel sides of the trapezoid have lengths 1515 and 2525 meters. What fraction of the yard is occupied by the flower beds?
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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.