21.The area bounded by the water line of a lake and the contours 1, 2, 3, and 4, are as follows: A1 = 10,350 sqm A2 = 8, 200 sqm A3 = 7,150 sqm A4 = 6,400 sqm %3D The contour interval is 2m, compute the volume of water in the lake. a) 34,567 cum b) 47,450cum c) 42.345cum

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