Scale Factor on Perimeter and Area

How does scale factor change the perimeter?

• by the scale factor

• by the scale factor squared

• by the scale factor cubed

How does scale factor change the area?

• by the scale factor

• by the scale factor squared

• by the scale factor cubed

The original perimeter of a rectangle is 30cm, if we enlarge it by a scale factor of 4 what is the new perimeter?

• 120

• 480

• 1920

The original area of a rectangle is 25cm² , if we enlarge it by a scale factor of 6 what is the new area?

• 150

• 900

• 5400

Choose the correct scale factor:

• 2

• 3

• 1/3

• 1/2

The figures are similar. What is the ratio of their perimeters?

• 18/24

• 3/4

• 1/2

• 36/24

Find the ratio (red to blue) of the perimeter.

• 11/6

• 6/11

• 121/36

• 36/121

Find the ratio (red to blue) of the area.

• 11/6

• 6/11

• 121/36

• 36/121

Find the ratio (red to blue) of the perimeter.

• 9/14

• 14/9

• 196/81

• 81/196

Find the ratio (red to blue) of the area.

• 9/14

• 14/9

• 196/81

• 81/196