Scale Factor with Dilations

When the scale factor of a dilation is less than one, the dilation is a reduction.

• True

• False

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

• addition 

• subtraction 

• multiplication 

• division 

Is this an enlargement or reduction? (blue = original image)

• reduction

• enlargement

What is the scale factor from ΔDEF to ΔABC?

• 1/2

• 7/3

• 2

• 10/3

_{Line AB corresponds with what line?} 

• XZ

• XY

• YZ

• YX

Dilate Point B by a scale factor of 3:

• (12,0)

• (12,12)

• (4,3)

• (0,12)

After dilations, the sides of the figure are...

• always smaller

• always larger

• the same

• proportional

Which is FALSE about dilations?

• The shape is the same.

• The size changes.

• Dilations can only occur with whole number scale factors

• Dilations produce similar figures

A triangle has vertices with coordinates (2,0), (3, -1) and (-2,-5). If the triangle is dilated by a scale factor of 3 with the origin as the center of dilation, what are the coordinates of the vertices of the image?

• (5,3), (6,2), (1,-2)

• (6,0), (9,-3), (-6,-15)

• (2/3,0), (1,-1/3), (-2/3,-5/3)

• (-1,-3), (0,-4), (-5,-8)

What is the scale factor if the triangle on the left is the original?

• 2

• 3/2

• 2/3

• 1/2