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2009 AMC 10AProblem 10P1-10~2 minPrint
Similar & Congruent TrianglesTriangles: Area & PythagoreanSet up the equation/formula and compute; no special trick needed

Triangle ABCABC has a right angle at BB . Point DD is the foot of the altitude from BB , AD=3AD=3 , and DC=4DC=4 . What is the area of △ABC\triangle ABC ?

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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.