Enlargement and Reduction

Multiple Choice

Similar or Congruent?

• Similar

• Congruent

Multiple Choice

Similar or Congruent?

• Similar

• Congruent

Multiple Choice

Similar or Congruent?

• Similar

• Congruent

Multiple Choice

Angle R is 90 degrees. What is the measure of angle R' ?

• 90

• 45

• 180

Enlargements

• A type of dilation

• The shape gets larger!

Reductions

• A type of dilation

• The shape gets _smaller

Multiple Choice

Enlargement or Reduction?

• Enlargement

• Reduction

Multiple Choice

Enlargement or Reduction?

• Enlargement

• Reduction

Multiple Choice

Enlargement or Reduction?

• Enlargement

• Reduction

Scale Factor

• The number your multiply the length of a figure by to make its image (copy).

• This does not affect angle measurements because angles stay the same!

Multiple Choice

If a AB measures 2 and the scale factor is 3, what would the measurement of A'B' be?

• 2

• 3

• 6

Multiple Choice

If a AB measures 4 and the scale factor is 1/2, what would the measurement of A'B' be?

• 1/2

• 2

• 4

• 8

Multiple Choice

What is the scale factor? (What do you multiply by to get from the original to the copy) if the original is on the top?

• 1/3

• 1

• 3

• 9

Multiple Choice

What is the scale factor? (What do you multiply by to get from the original to the copy) if the original is on the bottom?

• 1/3

• 1

• 3

• 9

Multiple Choice

What is the length of the missing side x?

• 6

• 3

• 2

Multiple Choice

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

• 1/2
• 7/3
• 2
• 10/3

Multiple Choice

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

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

Multiple Choice

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

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

Multiple Choice

What is the scale factor from ΔDEF to ΔABC?

• 2

• 3/2

• 2/3

• 1/2

Multiple Choice

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

• addition 
• subtraction 
• multiplication 
• division 

Multiple Choice

If the scale factor is less than 1, the new figure will be

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

Multiple Choice

What is the scale factor from ΔABC to ΔDEF?

• 2

• 3/2

• 2/3

• 1/2

Multiple Choice

Find the scale factor of the dilation. Then tell whether the dilation is a reduction or an enlargement.

• 2 / 5; reduction

• 5 / 2; enlargement

• 2 / 3; reduction

• 3 / 2; enlargement

Multiple Choice

If two polygons are SIMILAR, then the corresponding angles must be _____.

• Complementary

• Supplementary

• Congruent

• Linear pairs

Multiple Choice

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

• 1/3

• 48

• 4

• 3

Multiple Select

Choose all the scale factors that will result in enlargements

• 1

• 2

• 1/2

• 5

• 1.2

Multiple Select

Choose all the dilations that will result in a reduction

• 1

• 0.5

• 3/4

• 5/3

• 0.875

Multiple Choice

Find side length X.

• 16
• 18
• 2.4
• 15

Fill in the Blanks

If AB = 3 and the scale factor is 4 then how long is A'B'?

Fill in the Blanks

If A'B'=20 and AB=100 then what is the scale factor to map ABC onto A'B'C'?

Answer either as a fraction in reduced form or as an integer.

Fill in the Blanks

OA'=9 and OA=36. Determine A'C' if AC = 64

Fill in the Blanks

OA'=9 and OA=36. Determine A'C' if AC = 64

Multiple Choice

What kind of Dilation will take place when given the Scale Factor of ¹/_2.

• Enlargement

• Reduction