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A solid with three sides is a cylinder.
It wouldn't be a cube if the sides aren't equal in length. It would be called a rectangular prism.
a cube
a tetrahedron is a geometric solid that has 4 sides, all trianglular - it's like a pyramid with a triaglular base.
A cube would fit the given description
Depends on how much it weighs, if its hollow then maybe it would float. But doubting it would if its solid.
Depends on the medium, and whether the ball is solid or not. A solid ball would float on mercury, sink in water. If it were hollow enough (or filled with, say, cork) it would float in water.
it is hollow so it will float
float
Whether the solid will float or sink in a solid-liquid mixture depends on the relative densities of the solid and the liquid. If the density of the solid is greater than that of the liquid, then the solid will sink. If the density of the solid is less than that of the liquid, then the solid will float.
sink
That depends on the relative densities of the solid and the liquid. If the solid is denser than the liquid, the solid will sink. If the liquid is denser, the solid will float.
a book
A solid with three sides is a cylinder.
A superconductor.
A solid float on water if the density is lower than the density of water.
The clay boat (like a steel ship) displaces its own weight in the water. So, as long as the sides of the clay boat (or steel ship) is above the water level, it will float. A solid piece of clay will (like a stone) sink immediately.