A delta?
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A Rock
Area of triangle is = 1/2 base * height so 1/2*2*2.5= 2.5 km2
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.
The "area" of any shape means how much space it covers on the floor, table, wall, land, paper, etc. It takes more grass seed to plant a lawn on more land 'area', and less paint to cover a wall with less 'area'. When you buy carpet, they ask you the 'area' of the floor you need to cover.
it has flat land and low