Understanding Similar Polygons and Scale Factors

What is the scale factor if the side length of the smaller figure is 2 and the larger figure is 7?

• 5:2

• 2:5

• 2:7

• 7:2

In problem 7, if the smaller figure's side is 6, what is the missing side length of the larger figure?

• 24

• 18

• 21

• 28

For problem 8, if the scale factor is 2:3 and the known side length is 12, what is the missing side length?

• 12

• 6

• 8

• 10

In problem 9, what is the missing side length if the scale factor is 5:6 and the known side length is 30?

• 35

• 20

• 25

• 30

For problem 10, if the scale factor is 1:7 and the known side length is 7, what is the missing side length?

• 42

• 49

• 63

• 56

In problem 11, if the scale factor is 2:3 and the known side length is 9, what is the missing side length?

• 3

• 5

• 6

• 9

For problem 12, what is the missing side length if the scale factor is 1:2 and the known side length is 6?

• 4

• 3

• 2

• 5

In problem 13, if the scale factor is 6:7 and the known side length is 35, what is the missing side length?

• 25

• 28

• 32

• 30

For problem 14, what is the missing side length if the scale factor is 1:3 and the known side length is 27?

• 10

• 7

• 8

• 9

What is the process called when you multiply across the terms of a proportion to solve for a missing value?

• Cross addition

• Cross subtraction

• Cross multiplication

• Cross division