Length of the fence of a trapezium A shaped field ABCD is 120 m. IF BC = 48 m, CD = 17 m

Length of the fence of a trapezium A shaped field ABCD is 120 m. IF BC = 48 m, CD = 17 m and AD = 40 m, find the area of this field. Side AB is perpendicular to the parallel sides AD B and BC.
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