Similar Triangles Find the Scale Factor and Missing Side Lengths

The triangles shown are similar. What is the scale factor from ABC to DEF?

• 2

• 3

• 4

• 5

The triangles shown are similar. Find the length of side EF.

• 3

• 12

• 15

• 18

The triangles shown are similar. Which side corresponds with side BC?

• AB

• DE

• EF

• CA

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

• 3.75

• 9.75

• 10

• 12

• 2

• 1/2

• 2/3

• 3/2

Triangle ABC and XYZ are similar.  Use your knowledge of scale factor to find the length of X.

• 20

• 25

• 100

• 40

Find missing side

• 5

• 7

• 9

• 11

Find the values for V'W' AND U'W'

b

c

d

e

a

Same as Scale factor above

105

And again, same

77

7

What is the scale factor from ΔDEF to ΔABC?

• 1/2

• 7/3

• 2

• 10/3

What is the scale factor from ΔDEF to ΔABC?

• 2

• 3/2

• 2/3

• 1/2