Perimeter and area


The perimeter is the total distance all the way around the outside of a 2D shape.

The units for perimeter are:

  • mm (millimetre)
  • cm (centimetre)
  • m (metre)
  • km (kilometre)


Diagram of a 2d shape with perimeter values

Perimeter = 3cm + 4cm + 5cm + 2cm + 8cm = 22cm


The area of a 2D shape is the amount of surface it covers.

The units for area are:

  • mm^{2} (square millimetre)
  • cm^{2} (square centimetres)
  • m^{2} (square metre)
  • km^{2} (square kilometre)


Diagram of a rectangle made up of square centimetres

Area = 24 squares

Area = 24cm^{2} (24 square centimetres)