Volume and surface area

The volume of a 3D shape is the space inside it.

12 cube cuboid

This cuboid contains 12 small cubes. Each small cube has a volume of 1 cm3.

Cube (1cm x 1cm x 1cm)

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.

View of a cube and three of its sides

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.