Intro to Dilations

Which of the following statements are true about the dilation that occurred? Select all that apply.

• the pre-image increased in size

• the pre-image decreased in size

• the length of AB to A'B' increased from 2 to 4

• the length of AB to A'B' decreased from 4 to 2

• the scale factor used for this dilation was 1/2 or 0.5

Dilations can only increase in size.

• true

• false

Dilations always result in CONGRUENT images.

• true

• false

Dilations create SIMILAR figures, which means the dimensions (side lengths) of the images must be...

• proportional ratios

• exactly the same

• even numbers

• odd numbers

Even though the size of the image changed, which statement below explains why this is NOT an example of a dilation? (NOT similar figures)

• the width increased in size, but the height did not change at all (they must change the same way)

• the width of the image got larger, not smaller

• this is a dilation actually, because the image increased 3 times the original size

• these are not a dilation, because the two images are congruent

SCALE FACTOR describes the number that is multiplied by a pre-image that determines...

• how many times bigger an image gets

• how many times smaller an image gets

• how many times bigger or smaller an image gets

Why does the scale factor of "1" NOT result in a dilation?

• making an image 1 times larger would not change its size, therefore it would remain the same/congruent image

• 1 cannot be a scale factor because it is not a fraction

• 1 cannot be a scale factor because it is not a decimal

Which scale factor below would result in a dilation that is smaller than the pre-image?

• 0.5

• 3.5

• 2

• 4

Which of the following scale factors could have possibly created the dilation shown?

• 
• 
• 
• 

What scale factor was used in this magnifying glass?

• 10

• 5

• 2.5

• 2