text: Bullshit, there is no relation between the surface of a shape and the volume it holds, unless the shape is to be known, like a cube or a sphere. The shape of a mango fruit is to complex, but you you could simplify it to a sphere. Then you can calculate the surface from the waterdisplacement\nV = 4/3 Pi r^3\nA = 4 Pi r^2\n=> A = 3/r V\nThe surfacearea you find wouldn.t be exact though.