Dilations on Graph

What do we call a figure BEFORE a transformation is performed?

This tells us how much farther away from, or closer to the center of dilation points will move:

Which one will correctly find scale factor?

• Scale factor = Length of the image / Length of the preimage

• Scale factor = Length of the preimage / Length of the image

When dilating, what mathematical operation is always used with the scale factor?

• addition 

• subtraction 

• multiplication 

• division 

This is a fixed point that is the starting point for all dilations:

• scale factor

• dilation

• center of dilation

• pre-image

Choose all statements that are true about dilations.

• Dilations cause angle measures to change.

• Dilations cause side lengths to change.

• When k > 1, a dilation results in an enlargement.

• The length of the preimage equals the length of the image times the scale factor.

• Dilations result in a parallel image.

If the triangle on the left is mapped onto the triangle on the right, what is the scale factor?

• 1

• 3

• 1/3

• 8

If the point (8, 12) was dilated through the origin to become point (2, 3). What is the scale factor?

• ½

• ¼

• 4

• 2

State the coordinates of the image of point B after a dilation with a scale factor of 2 and centered at point A.

• (-4,2)

• (-8,4)

• (-4,6)

• (-2,-2)

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

• Yes, enlarge

• Yes, reduce

• No