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Maths Year Ten COPY > Enlargement > Flashcards

Flashcards in Enlargement Deck (21)
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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

What do you use to find the scale factor in enlargement?

Corresponding angles