Geometry Dilations

What is a dilation?

• The process of making a polygon larger or smaller without changing its shape

• The process of making a polygon move up, down, left, or right without changing its shape or size

• The process of making a polygon flip over an invisible line without changing its shape or size

• The process of making a polygon turn along quadrants without changing its shape or size

If the scale factor is less than one, the new figure will be

• an enlargement
• a reduction
• a scale factor
• bigger

If the scale factor is greater than one, the new figure will be

• a reduction
• an enlargement
• a scale
• not proportional

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

• addition 
• subtraction 
• multiplication 
• division 

Choose all the scale factors that will result in enlargements

• 1

• 2

• 1/2

• 5

• 1.2

What is the scale factor from the small fry to the large fry?

• 1/3

• 48

• 4

• 3

What is the scale factor from the small shape to the big shape?

• 1/2
• 7/3
• 2
• 10/3

The dilation is going to be an ​ (a)   .

So, the scale factor must be ​ (b)   than 1.

• enlargement
• reduction
• less
• greater

What is the formula for scale factor?

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

• B' (2 , 4.5)

• B' (-8 ,-18)

• B' (8 ,18)

• B' (9 ,4)