Scale Factor with Area and Perimeter

If the scale factor is 5, how times larger will the area of the big square be compared to the smaller square?

• 5

• 20

• 25

How does scale factor change the perimeter?

• by the scale factor

• by the scale factor squared

• by the scale factor cubed

A figure is multiplied by the scale factor 1/4. What will be the change in perimeter?

• The perimeter will be 1/4 the original perimeter.

• The perimeter will be 1/8 the original perimeter.

• The perimeter will be 1/16 the original perimeter

When multiplying by a scale factor the perimeter will multiply by...

• The same scale factor

• The scale factor doubled

• The scale factor squared (to the power of 2)

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

• 120

• 480

• 1920

If the perimeter of a rectangle was 20in and now it is is 80in, what is the scale factor that was used?

• 4

• 2

• 40

• 20

Both the side lengths and perimeter are 3 times larger in the bigger rectangle.

• True

• False

• The new perimeter will be 2 times the old perimeter.

• The new perimeter will be 1/2 of the old perimeter.

• The new perimeter will be 3 times the old perimeter.

• The new perimeter will be 4 times the old perimeter.

• The perimeter of the new rectangle will be the same as the perimeter of the original rectangle.
• The perimeter of the new rectangle will be 2.5 times as large as the perimeter of the original rectangle.
• The perimeter of the new rectangle will be 5 times as large as the perimeter of the original rectangle.

A scale factor of 2 is used to enlarge the dimensions of a square. What is the effect of this change on the area of the square?

• The area will be half as big.

• The area will be twice as large.

• The area will be 4 times larger.

• The area will be 8 times larger.

• The area will not change.