AMC 10 Step by Step
2025 AMC 10AProblem 3P1-10~3 minPrint

How many isosceles triangles are there with positive area whose side lengths are all positive integers and whose longest side has length 20252025 ?

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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.