Geom 7.6 Dilations

A dilation is which of the following: 

• only an enlargement
• only a reduction
• either an enlargement or a reduction
• neither an enlargement nor a reduction

A dilation always produces a similar figure. Similar figures have the same ______ but different ______. 

• measure; shapes
• sizes; shapes
• value; measures
• shape; sizes

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

**Remember A is the pre-image and A' is the image

• Enlarge

• Reduce

• None of the above

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

**Remember A is the pre-image and A' is the image

• Yes, enlarge

• Yes, reduce

• No

What scale factor was used to produce the image?

**Remember A is the pre-image and A' is the image

• 2

• 3

• 1/3

• 1/2

What scale factor was used to produce the image?

**Remember A is the pre-image and A' is the image

• 1

• 7

• 18

• 49

What scale factor was used to produce the image?

**Remember A is the pre-image and A' is the image

• 2

• -2

• ¹/₂

• 1

State the coordinate of the image of the given point B (-10,-6) under a dilation with center at the origin with the given scale factor k = 1/2.

• (5,3)
• (20,12)
• (-20,-12)
• (-5,-3)

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 r = 2.

• (2,4.5)
• (-8,-18)
• (8,18)
• (9,4)

What effect does a dilation with a scale factor of 2 have on the side lengths of the original figure?

• subtracted by a factor of 2

• added by a factor of 2

• multiplied by a factor of 2

• divided by a factor of 2