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area of triangle wanted 2021 IMOC qualification problem, G0

Source:

December 30, 2021
geometry

Problem Statement

Let D,E,FD,E,F be the midpoints of BCBC ,CACA, ABAB in ABC\vartriangle ABC such that AD=9AD= 9, BE=12BE= 12, CF=15CF= 15. Calculate the area of ABC\vartriangle ABC