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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