MA28-05 Maths Coming soon
Enlarging a shape by a positive or fractional scale factor
MA28-05
This lesson is coming soon.
In this lesson
Enlarge a shape from a given centre using ray lines for a whole-number or fractional scale factor, and state the centre and scale factor of a given enlargement.
What it covers
- Enlarging a shape from a given centre using ray lines for a whole-number scale factor greater than 1
- Enlarging a shape from a given centre using ray lines for a fractional scale factor (0<k<1)
- Identifying the centre and scale factor of a given enlargement
- Stating that enlargement preserves angles but not lengths (unless scale factor is 1)
- Using the word 'enlargement' correctly even when the image is smaller than the object
Key words
For: AQA GCSE 8300, Edexcel IGCSE 4MA1, OCR GCSE J560, Cambridge IGCSE 0580, Edexcel GCSE 1MA1, Eduqas GCSE C300
On the specification
| Board | Spec | Statement |
|---|---|---|
| AQA GCSE 8300 | G7 | Identify, describe and construct congruent and similar shapes, including on coordinate axes, by considering rotation, reflection, translation and enlargement |
| Edexcel IGCSE 4MA1 | F5.2J | Understand that enlargements are specified by a centre and a scale factor |
| Edexcel IGCSE 4MA1 | F5.2L | Enlarge a shape given the scale factor |
| Edexcel IGCSE 4MA1 | F5.2K | Understand that enlargements preserve angles and not lengths |
| OCR GCSE J560 | 9.04b | Enlarge a simple shape from a given centre using a whole number scale factor, and identify the scale factor of an enlargement. |
| Cambridge IGCSE 0580 | C7.1 | Transformations |
| Cambridge IGCSE 0580 | E7.1 | Transformations |
| Edexcel GCSE 1MA1 | G7 | Identify, describe and construct congruent and similar shapes, including on coordinate axes, by considering rotation, reflection, translation and enlargement (including fractional scale factors) |
| Eduqas GCSE C300 | FG7 | Identify, describe and construct congruent and similar shapes, including on coordinate axes, by considering rotation, reflection, translation and enlargement (including fractional scale factors) |
| Eduqas GCSE C300 | HG7 | Identify, describe and construct congruent and similar shapes, including on coordinate axes, by considering rotation, reflection, translation and enlargement (including fractional and negative scale factors) |
For teachers
This GCSE Maths lesson teaches enlarging a shape by a positive or fractional scale factor. By the end, students should be able to enlarge a shape from a given centre using ray lines for a whole-number or fractional scale factor, and state the centre and scale factor of a given enlargement. It works through two worked examples and the mistakes examiners report.