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I am not sure of the answer but it is not a delta since a delta need not be marshy and the question asks about marshy land.
A delta?
Area of triangle is = 1/2 base * height so 1/2*2*2.5= 2.5 km2
1 acre = 43,560 square feet = 4,840 square yardsAn acre of land can be round, oval, square, rectangular, triangular, hexagonal, or irregular. Knowing the area doesn't tell what the shape is. In fact, it can be any shape; so long as it has a total area of 43,560 square feet, it is one acre.
A Rock