Exactly the same as for a non-floating object. Finding the volume of a shape does not vary, (i.e it's always something along the lines of height*width*depth, or area of base *height. "Table" or "surface" is irrelevant, since if it not a variable in the formula). This is true whether the object is floating or not.
Chat with our AI personalities
The volume of liquid displaced has the same mass as the floating object.
To find the volume of an object, we use an overflow cylinder as it gives a measure of the volume of the object by displacing an equal amount of water into the beaker.
The answer depends on what information you do have about the object.
The volume of a rectangle is 0. It is a 2-dimensional object and so has no volume.
The measure, in cubic centimetres IS the volume!