### Key Stage 3 Maths - Lesson Objectives, Keywords and Resources - Year 9 - Shape, Space and Measures

# Enlargements

## Lesson Objectives

To be able to:

- Enlarge 2-D shapes, given a centre of enlargement and a whole-number, a fractional or a negative scale factor.
- Identify the scale factor of an enlargement as the ratio of the lengths of any two corresponding line segments.
- Recognise that enlargements preserve angle but not length, and understand the implications of enlargement for perimeter.

## Keywords:

object, image, centre of enlargement, scale factor, negative enlargement, negative scale factor, fractional scale factor.

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