The perimeter is the total distance around the edge of a 2D shape. Examples of metric units of distance are millimetres (mm), centimetres (cm) and metres (m).

Some examples of solids that incorporate 2D shapes are mentioned in this video by Sanchit — for example, a cube has six square faces.

Save guides, add subjects and pick up where you left off with your BBC account. The perimeter is the total distance around the edge of a 2D shape. Examples of units of distance are millimetres (mm ...