Dilations and Scale Factors

Did the image enlarge, reduce or none of the above?

• Enlarge
• Reduce
• None of the above

What scale factor was used to produce the image?

• 2
• 3
• 1/3
• 1/2

What scale factor was used to produce the image?

• 2
• -2
• ¹/₂
• 1

What scale factor was used to produce the image?

• 2.5
• 1.5
• 3.5
• 4

Dilate the figure by a scale factor of 3 with the origin as the center of dilation. What are the coordinates of the image?
A(3,3) B(6,6) C(9,3)

• A'(9,9) B'(18,18) C'(27,9)
• A'(6,6) B'(9,9) C'(12,6)
• A'(0,0) B'(3,3) C'(6,0)
• A'(1,1) B'(2,2) C'(3,1)

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

• ½
• ¼
• 4
• 2

In a dilation what mathematical operation is used with the scale factor?

• addition 
• subtraction 
• multiplication 
• division 

A scale factor of less than one means

• that the image will be larger than the pre-image.
• That the image will be the same as the pre-image.
• That you need to subtract that amount off  of each side.
• That the image will be a reduction of the pre-image.

Which of the following is the algebraic representation for a dilation?

• (x, y) → (x, 3y)

• (x, y) → (3x, 3y)

• (x, y) → (x, y - 3)

• (x, y) → (.5x, .4y)

Which of the following transformation will result in an image that is similar, but not congruent, to its original image?

• translation
• reflection
• rotation
• dilatation