Enlargement and reduction by a scale factor

Discover how enlargements and reductions by a scale factor work!

Notes

Discover how enlargements and reductions by a scale factor work!

How many times have you wondered how to draw a map?

You just have to use a scale factor and reduce the map!

On the other side, you can enlarge a picture to see all the smallest details.

 

Table of contents of this lesson: Enlargement and reduction by a scale factor

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Enlargements

An enlargement by a scale factor is the opposite of a reduction.

For example, an enlargement with scale factor 4 means that one centimetre corresponds to 4 centimetres in the enlarged picture.

So, if the side of a shape measures 28 cm in the enlarged picture, it actually measures 28 cm : 4 cm = 7 cm.

Look at the picture: what scale factor has been used?

Reductions

Reductions

How do perimeters and areas change?

How do perimeters and areas change?