an enlargement is a transformation where an object maps to an image of the same shape but different size (unless the scale factor is 1).

the object and the image are said to be similar.

an enlargement requires a centre of enlargement and a scale factor.

Key Skills

  • drawing the image given an object, the centre of enlargement and the scale factor.
  • locating the centre and calculating the scale factor given the object and the image.
  • naming and using the key properties of enlargement.
  • understanding the vocabulary of enlargement i.e. what the words mean!


enlargementinvariantisometryindirect transformationcongruent,transformationimageobject, scale factorcentre of enlargement, similar figures