Key learning points

1. Each length in the shape is multiplied by the scale factor.
2. Each vertex in the object is a given distance from the centre of enlargement.
3. This distance is also multiplied by the scale factor to give the distance of the image's vertex.
4. A positive fractional scale factor produces an image that is smaller than the original.
5. To enlarge, you need the centre of enlargement and a scale factor.

Common misconception

Keywords

• Transformation - A transformation is a process that may change the size, orientation or position of a shape.

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

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

• Centre of enlargement - The centre of enlargement is the point from which a shape is enlarged.