text: how is this? can someone explain...? when i asked a question on how to measure the surface area of the mango fruit without destroying the fruit, some said that the amount of water displaced when the mango is submerged into a pail or something is equal to the surface area! how can that be? 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 v = 4/3 pi r^3 a = 4 pi r^2 => a = 3/r v the surfacearea you find wouldn.t be exact though.