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

• Object - The object is the starting figure before a transformation has been applied.

• Image - The image is the resulting figure after a transformation has been applied.

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

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

• Invariant - A property of a shape is invariant if that property has not changed after the shape is transformed.

Common misconception