Finding Scale Factors

The point A (8, 12) was dilated to become point A' (2, 3). What was the scale factor?

• ½

• ¼

• 4

• 2

Marquel took a photograph and printed it to be a size of 4 units by 4 units. She wanted to enlarge the original photograph to a size of 5 units by 5 units. What was the scale factor from the original photo to the photo that is 5 units by 5 units?

• 125%

• 250%

• 100%

• 156%

• 1%

Janel took a photograph and printed it to be a size of 5 units by 5 units. She wanted to enlarge the original photograph to a size of 10 units by 10 units. What was the scale factor from the original photo to the photo that is 10 units by 10 units?

• 200%

• 2%

• 500%

• 40%

• 240%

Four pictures are enlarged. For which two pictures are the scale factors the same?

• Picture A and Picture C

• Picture A and Picture D

• Picture B and Picture C

• Picture C and Picture D

• Picture A and Picture B

Litzy is making a scale drawing of her apartment for a school project. The apartment is 28 feet wide. On her drawing, the apartment is 7 inches wide. What is the scale of Litzy's drawing?

• 1 inch = 4 feet

• 1 inch = 28 feet

• 1 inch = 7 feet

• 1 inch = 0.25 feet

Rectangle ABCD is similar to rectangle EFGH. What is the scale factor from rectangle ABCD to rectangle EFGH?

• 1.5 (150%)

• 2.5 (250%)

• 5.0 (500%)

• 19.0 (1,900%)

Identify the scale factor from triangle ABC to triangle A'B'C'. Then, find the value of x.

• Scale Factor: 50% x= 4.5

• Scale Factor: 1/2%, x = 4.5

• Scale Factor: 200%, x = 4.5

• Scale Factor: 50%, x = 18

• Scale Factor: 20%, x = 5

Identify the scale factor from triangle DEF to triangle D'E'F'

• 1.5

• 0.7

• 1.75

• 2

• 1.25

Identify the scale factor to get from triangle BNQ to triangle B'N'Q'.

• 1.25

• 1.5

• 0.8

• 0.5

• 2.25

Identify the scale factor from triangle RST to triangle R'S'T'.

• 0.75

• 1.75

• 1.3

• 0.95

• 0.68