Flashcards in Enlargement Deck (21)

Loading flashcards...

1

## What is the start image called in enlargement?

### The object

2

## What is the enlarged image called in enlargement?

### Image

3

## How can we tell what the image is in enlargement?

### It has dashes next to the letters of the points

4

## How do we enlarge?

### Square lengths by scale factor to enlarge

5

## How can we work out the scale factor?

### Divide one edge of image by same edge in object

6

## What does enlargement not effect?

### The size of angles

7

## What does enlargement produce?

### Similar shapes

8

## What is the rule for similar shapes?

### In similar shapes angles are the same but length of lines have all changed

9

## How do you enlarge an object using a point if enlargement?

### Draw lines from the centre of enlargement to all points of the shape

10

## What does enlarging by a negative scale factor do to the produced image?

### The image produced when you enlarge a shape by a negative scale factor is a rotation of the enlarged object, 180* in the centre of enlargement

11

## What does enlarging by a positive scale factor do to the produced image?

### Enlarging by a positive scale factor makes the image grow bigger and further away from the centre of enlargement

12

## What happens when the centre of enlargement is on the shape?

### The image will overlap the object

13

## When the scale factor is negative and the centre of enlargement is on the shape what happens to the image?

### The shape rotates but one point remains attached to the object

14

## What is always the same in both the object and the image?

### The angles

15

##
A

|. \

B |. \

|___5cm\ C

|. \

B'|_ _____________\C'

15cm

What is The scale factor?

###
B' C'

-----

B C. =3

SF: 3

16

##
A

|. \

B |. \

|___5cm\ C

|. \

B'|_ _____________\C'

15cm

Where is the centre of enlargement?

### A

17

##
A

|. \

B |. \

|___5cm\ C

|. \

B'|_ _____________\C'

15cm

What do you know about the angles?

### They are the same in both the object and the image

18

##
A

|. \

B |. \

|___5cm\ C

|. \

B'|_ _____________\C'

15cm

How can you express the relationship between the lengths?

### AB(with a hat)C' = AB(with a hat)C

19

## In an enlargement, what is one word to describe the image and the object?

### Similar

20

## What two things happen in similar shapes?

###
The angles stay the same

The lengths increase in proportion

21