Scale Factor A to B

The two rectangles are scale drawings. What is the measurement of x?

• 21

• 1.25

• 20

• 4

• 0.25
• 0.5
• 2
• 1/2

What is the scale factor from the small fry to the large fry?

• 1/3

• 48

• 4

• 3

The two right triangles below are similar. What is x, the missing side length in triangle DEF? 

• 3.75

• 9.75

• 10

• 12

Which rule would dilate shows a scale factor of 4

• (x, y) → (y, x)

• (x, y) → (x + 4, y + 4)

• (x, y) → (x, -y)

• (x, y) → (4x, 4y)

Match the following dilations by a scale factor of 1/2.

• (0,0)

• (0, -10)

• (0, -5)

• (6,8)

• (3,4)

• (-6,-8)

• (5,1)

• (0,0)

• (-3, -4)

• (10,2)

Answer explanation

Note that 0/2 is still 0

so (0,0) dilated by 1/2 is still at (0,0)

(0,-10) dilated by a 1/2 is at

(0, -5)

The pair of figures is similar. Find the missing side.

• x = 20

• x = 12

• x = 5

• x = 4

Which figure is scale copy of the original figure?

• A

• B

• C

• D

What is the scale factor?

• 1

• 2

• 3

• 4

Which of the following are scaled copies of the original portrait? Select ALL the apply.

• A

• B

• C

• D

• E