Key learning points

1. An enlargement means a change in size.
2. The lengths of the lines may change when enlarged.
3. The angles inside an object do not change when enlarged.
4. When an object is enlarged, the image is similar.

Keywords

• Similar - Two shapes are similar if the only difference between them is their size. Their side lengths are in the same proportions.

• Enlargement - Enlargement is a transformation that causes a change of size.

• Scale factor - Scale factor is the multiplier between similar shapes that describes how large one shape is compared to the other.

Common misconception