Year 9

Year 9

# Describing enlargements

## Lesson details

### Key learning points

1. In this lesson, we will learn how to describe an enlargement using the terms centre of enlargement and scale factor.

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

## Video

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## Worksheet

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## Starter quiz

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### 5 Questions

Q1.
Which of the following options best describes an enlargement of scale factor -1?
The image has a greater area than the object and has a different orientation
The image has a greater area than the object and has the same orientation
The image has the same area and has the same orientation as the object
Correct answer: The image has the same area as the object and has a different orientation
Q2.
Which of the following options best describes an enlargement where the scale factor is less than -1?
Correct answer: The image has a greater area than the object and has a different orientation
The image has a greater area than the object and has the same orientation
The image has the same area and has the same orientation as the object
The image has the same area as the object and has a different orientation
Q3.
Which of the below images show a correct enlargement of scale factor -1, about the given point?
Option 1
Option 3
Option 4
Q4.
Which of the below images show a correct enlargement of scale factor -2, about the given point?
Option 1
Option 2
Option 4
Q5.
Which of the following statements is incorrect?
Correct answer: An enlargement only ever makes a shape bigger
Negative enlargements change the orientation of the image
The angles in the object and image are always the same
The area of the image will change if the scale factor is not -1 or 1

## Exit quiz

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### 5 Questions

Q1.
Which of these is an incomplete description of an enlargement?
Shape 3 has been enlarged about point (1, 3) with scale factor -2
Correct answer: Shape A has been enlarged by scale factor -2
Shape B has been enlarged by scale factor -2, about (1,3)
Q2.
Which of the following is the correct description of the below enlargement?
Scale factor 2.5, centre (1,2)
Shape A has been enlarged by scale factor 2
Correct answer: Shape A has been enlarged by scale factor 2.5, centre (1, 2)
Shape A has been enlarged by scale factor 5, centre (2, 1)
Q3.
A shape has been enlarged and the image has a larger area and is in a different orientation to the object. Which of the following options could describe this enlargement?
Correct answer: The object has been enlarged by scale factor -2, centre (1,0)
The object has been enlarged by scale factor 0.2, centre (1,0)
The object has been enlarged by scale factor 2, centre (1, 0)
The object has been enlarged by scale factor 2.2, centre (1,0)
Q4.
A shape has been enlarged and the image has a smaller area than the object and is in the same orientation. Which of the following options could describe this enlargement?
The object has been enlarged by scale factor -2, centre (1,0)
Correct answer: The object has been enlarged by scale factor 0.2, centre (1,0)
The object has been enlarged by scale factor 2, centre (1, 0)
The object has been enlarged by scale factor 2.2, centre (1,0)
Q5.
A shape has been enlarged and the image has a smaller area than the object and has a different orientation. Which of the following options could describe this enlargement?
Correct answer: The object has been enlarged by scale factor -0.2, centre (1,0)
The object has been enlarged by scale factor -2, centre (1, 0)
The object has been enlarged by scale factor 0.2, centre (1,0)
The object has been enlarged by scale factor 2.2, centre (1,0)