Scale Factors and Area

• 3

• -3

• 0.3

• 1/3

If both dimensions of a rectangle are doubled, then which of the following statements about its perimeter will be true?

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

• The new perimeter will be double the old perimeter.

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

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

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

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

• 3

• 6

• 9

• 27

If a square's side lengths enlarged by a SF of 2, then which of the following statements about its area will be true?

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

• The new area will be 16 times the old area.

• The new area will be 1/4 of the old area.

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

If a square's side lengths are doubled, then which of the following statements about its area will be true?

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

• The new area will be 16 times the old area.

• The new area will be 1/4 of the old area.

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

Amanda made a scale drawing of a square garden, which has a side length of 25 feet. She used the scale 2 inches = 5 feet.

What will be the area of the scale drawing?

• 10 in²
• 25 in²
• 100 in²
• 484 in²

A rectangle has the dimensions 4cm by 5cm. A scale factor of 3 is used to enlarge the rectangle. What is the new area?

• 20 cm²

• 60 cm²

• 180 cm²

• 100 cm²

A rectangle that is 2 inches by 3 inches has been scaled by a factor of 7

 What is the area of the scaled copy?

• 20 sq in

• 42 sq in

• 49 sq in

• 294 sq in