Discover how to work out the area of a triangle, by working out the area of a rectangle and then dividing ... in millilitres and litres. What is volume? Find out how the volume of a 3D shape ...

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 ...