Dilations and Similar Figures Review

A dilation is which of the following: 

• only an enlargement

• only a reduction

• Either an enlargement or a reduction

• Neither an enlargement or a reduction

The __________ is the ratio of a length of the new figure to the corresponding length on the original figure.

• reduction

• enlargement

• scale factor

• center of dilation

State the coordinate of the image of the given point B (4,9) under a dilation with center at the origin with the given scale factor of 2.

• B' (2 , 4.5)

• B' (-8 ,-18)

• B' (8 ,18)

• B' (9 ,4)

What scale factor was used to produce the image?

• 2

• -2

• ¹/₂

• 1

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

• addition 

• subtraction 

• multiplication 

• division 

How do you write the algebraic notation when the scale factor is 3?

• (x, y) goes to (1/3x, 1/3y)

• (x, y) goes to (-3x, -3y)

• (x, y) goes to (x + 3, y + 3)

• (x, y) goes to (3x, 3y)

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

• Enlarge

• Reduce

• None of the above

Does the image show a Dilation? If yes, did the image enlarge, reduce or none of the above?

• Yes, enlarge

• Yes, reduce

• No

What scale factor was used to produce the image?

• 2.5

• 1.5

• 3.5

• 4

Triangle ABC is similar to triangle FGH. What is the value of <B if the measure of <G is 66 degrees?

• 66 degrees

• 114 degrees

• 57 degrees

• 180 degrees