Scale Factor of Two Figures

The two right triangles below are similar. What is x, the missing side length in triangle DEF? 

• 3.75

• 9.75

• 10

• 12

Which figure is scale copy of the original figure?

• A

• B

• C

• D

What is the scale factor?

• 1

• 2

• 3

• 4

Which of the following are scaled copies of the original portrait? Select ALL the apply.

• A

• B

• C

• D

• E

Is Figure B a scaled copy of Figure A?

• Yes

• No

The pair of figures is similar. Find the missing side.

• x = 20

• x = 12

• x = 5

• x = 4

Find the scale factor of the enlargement from C to A

• 2

• 1/2

• 3

• 1/3

Find the scale factor of the enlargement from X to Y

• 1/2

• 3

• 2

• 4

The pair of figures is similar. Find the missing side.

• x = 12

• x = 3

• x = 40

• x = 4

Tell whether the two figures are similar. Explain your reasoning. (Hint: are they proportional?)

• Yes, similar because they are the same shape and side lengths are proportional.

• No, not similar because they are the same shape, but side lengths are not proportional.

• Yes, same shape

• No, different sizes