Dilations Test Review

Dilation is...

• a transformation that changes the size of a figure by multiplication. (Does not stay congruent)

• a transformation that changes the size of a figure by addition or subtraction. (Does stay congruent)

Which transformation does not preserve congruence?

• Translation

• Rotation

• Dilation

• Reflection

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

• addition 
• subtraction 
• multiplication 
• division 

What is the effect of a dilation with a scale factor greater than 1?

• Enlarges the figure

• Reduces the figure

• Preserves the figure's size

• Changes the figure's shape

Which scale factors would increase an image? (multiple answers)

• 5

What is the effect of a dilation with a scale factor less than 1?

• Enlarges the figure

• Reduces the figure

• Preserves the figure's size

• Changes the figure's shape

Which scale factors shrink an image?(multiple answers)

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

• Yes, enlarge

• Yes, reduce

• No

What is the proportional side ratio of FG to XY in the similar triangles ΔFGH ~ ΔXYZ?

• FG/XY = GH/YZ

• FG/XY = FH/XZ

• FG/XY = FG/XY

• FG/XY = GH/XZ

What is the rule of dilation for a rectangle dilated by a scale factor of 9/5?

• (x, y) → (9/5x, 9/5y)

• (x, y) → (5/9x, 5/9y)

• (x, y) → (x+9, y+5)

• (x, y) → (9x, 5y)