Calculating Scale Factors

The ratio between matching sides in similar shapes is known as the SCALE FACTOR.

Written Work First - copy the following notes into your workbook

Special Notation The new shape is known as the IMAGE of the ORIGINAL. Use the link below and then copy the example and description into your workbook: LINK to original v image EXAMPLE Scale Factors The ratio between matching sides is known as the SCALE FACTOR.

Scale Factor = Image length Original length

Use the slider to change the scale factor. Move the blue dots to change the shape.

What did you discover? Use the Geogebra activity to help answer these questions:

When the scale factor is less than 1, the image created is:

Select all that apply

A
smaller than the original
B
the same size as the original
C
bigger than the original

Check my answer (3)

When the scale factor is equal to 1, the image created is:

Select all that apply

A
smaller than the original
B
the same size as the original
C
bigger than the original

Check my answer (3)

When the scale factor is greater than 1, the image created is:

Select all that apply

A
smaller than the original
B
the same size as the original
C
bigger than the original

Check my answer (3)

Calculating Scale Factors

Written Work First - copy the following notes into your workbook

Use the slider to change the scale factor. Move the blue dots to change the shape.

What did you discover? Use the Geogebra activity to help answer these questions:

New Resources

Discover Resources

Discover Topics