Volume and surface area
The volume of a An object with width, height and depth, eg a cube. shape is the space inside it.
This cuboid contains 12 small cubes. Each small cube has a volume of 1 cm3.
The volume of the cuboid is 12 cm3.
The surface area of a 3D shape is the total area of all the faces.
A cube has six faces which are all squares.
The area of one face is:
\(5 \times 5 = 25~\text{cm}^2\)
There are six faces with the same area.
The surface area of the cube is \(6 \times 25 = 150~\text{cm}^2\).