A scale factor can be used to enlarge or reduce a shape.
Shape A below is enlarged by scale factor to give Shape B.
The scale factor describes the size of an enlargement or reduction.
For example, a scale factor of means that the new shape is twice the size of the original.
A scale factor of means that the new shape is three times the size of the original.
A scale factor of means that the new shape is half the size of the original.
To calculate the scale factor, we use the following:
You can get the 'big' and 'small' from the corresponding sides on the figures.
Rectangles is an enlargement of rectangle . What is the length of ?
is on the bigger rectangle, therefore we will be using an enlargement scale factor.
Therefore is times .
(You can type in your calculator )