AMC 10 Step by Step
2013 AMC 10AProblem 15P11-15~3 minPrint

Two sides of a triangle have lengths 1010 and 1515 . The length of the altitude to the third side is the average of the lengths of the altitudes to the two given sides. How long is the third side?

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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.