Simple shapes

The perimeter of a shape is the distance around its boundary. This is a length, and is said to have {1} dimension (1D).

Example

An ant walks all the way around the edge of a rectangle, measuring 3~cm by 4~cm.

What distance will it have travelled?

Perimeter of a square diagram

Perimeter = 4 + 3 + 4 + 3 = 14~cm

curriculum-key-fact
When calculating the perimeter, remember to include the length of every side.