EnlargementOCR Stage 6

Enlargement

• Transforms a shape using– A Centre of Enlargement– A Scale Factor

• Exam questions sometimes involve enlargements on an x,y grid

Draw a 3 times enlargement of this shape

2

2

1

6

6

3

DIAGONAL lines are best drawn LAST

A shape we change is called an OBJECT

This OBJECT was enlarged with a SCALE FACTOR of 3

The shape it becomes is called the IMAGE

1 2 3 4 5 6 7 8 9 10 11 12 13 14

10

9

8

7

6

5

4

3

2

1

0

USING A CENTRE OF ENLARGEMENT

Enlarge Triangle by scale factor 2With Centre of Enlargement (0,0)

x

Move one VERTEX at a time

After Scale factor 2 Enlargement, how manyTimes will OBJECT fit inside its IMAGE?