Enlargement and Reduction

What is to be learned?

• How to enlarge (and reduce) shapes mathematically

Enlargement

Shape gets bigger!

Let’s be more mathematical

Enlargement Double

the size Every Line Doubles (

Scale Factor

= 2) Original

6 3 4 8

Enlargement

Tactics

Draw original first

Enlargement

Leave tricky lines till last

Double

the size

2 5

Original

4 10

Enlargement

Leave tricky lines till last

More Difficult

Two Tricky Lines!

8 Double

the size

4 4 3

Original

2 8 6

Enlargement

4

Reduction

Shape gets smaller!

Tactics Reduction

Draw original first Leave tricky lines till last

Half

the size (

Scale Factor

= ½ )

4 6

Original

6 3 2 3

Reduction

Enlargement and Reduction in Real Life

Photographs Models

Enlargement/Reduction Steps to Success

Multiply

all

lines by

Scale Factor

Leave tricky lines till last

Scale Factor 2 3 4

Original

6 8

Enlargement

The Test of Success

What is to be learned?

How to enlarge (and reduce) shapes mathematically

Scale Factor = ½

Steps to success Multiply

all

lines by

Scale Factor

Leave tricky lines till last

8 4

Original

2 4 1 2

Reduction