Similar Triangles Find the Scale Factor and Missing Side Lengths

Find the missing side. Triangle JKL is similar to triangle PQR.

• 24

• 54

• 18

• 72

Triangle ABC with side lengths 5, 12, and 13 will be dilated with a scale factor of 3. What will be the side lengths of the dilated triangle?

• 8, 15, 16

• 15, 36, 39

• 15, 24, 39

• 8, 36, 45

Triangle JKL will be dilated with a scale factor of 3/2. What will be the coordinates of J'?

• (3,9)

• (9,3)

• (1.5, 4.5)

• (4.5, 1.5)

What scale factor was used to dilate Triangle LMN to Triangle L'M'N'?

• 1/2

• 2

• 3

• 1/3

Triangle ABC will be dilated by a scale factor of 1/2. What will be the coordinates of B'?

• (-4,4)

• (-1,1)

• (1,-1)

• (1,1)

Are the triangles similar? If so, what is the scale factor from ΔDEF to ΔABC?

• Yes. 1.5

• Yes. ⅔

• Yes. 2

• No.

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

• 3.75

• 9.75

• 10

• 12

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

• x = 1

• x = 3

• x = 9

• x = 5

Solve for X.

• 2 ft

• 3 ft

• 4 ft

• 6 ft

Solve for x

• x=6

• x =1/6

• x = 7

• x=9