Composite 3D solids can be created from simple 3D solids ... times \pi \times 1.5^3 = 42.4~\text{cm}^3\) Total surface area of the salt shaker = surface area of cylinder + surface area of hemisphere.

Each small cube has a volume of 1 cm 3. The volume of the cuboid is 12 cm 3. The surface area of a 3D shape is the total area of all the faces. A cube has six faces which are all squares.