Discover how to work out the area of a triangle, by working out the area of a rectangle ... What is volume? Find out how the volume of a 3D shape can be calculated by counting cubes. Calculating ...

The surface area is made up of the end faces and rectangular faces that join them. To calculate the total surface ... 8 × 20 = 160. The volume of the prism is 160 cm³. The cross-section of ...