Perimeter and area

Perimeter

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)

Example:

Diagram of a 2d shape with perimeter values

Perimeter = \(3cm\) + \(4cm\) + \(5cm\) + \(2cm\) + \(8cm\) = \(22cm\)

Area

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)

Example

Diagram of a rectangle made up of square centimetres

Area = 24 squares

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