Finding Missing Sides of Similar Figures

Missing Measurements in Similar Figures

Set up a PROPORTION

• First identify corresponding sides. Label them to help you keep track of which are sets

• Create the proportion by making a ratio for figure 1 that corresponds to the same sides as figure 2

• Cross multiply to solve for the missing side. Remember two easy steps, Multiply the diagonal then divide the number with X

Multiple Select

What is the Scale Factor of these two similar triangles?

• 2

• 4

• 3

• 5

Multiple Select

What is the scale factor of the similar figures shown?

• 5

• 10

• 12

• 2

Multiple Select

What is the value of x? (remember to use your scale factor or create a proportion)

• 5

• 16

• 8

• 15

Multiple Select

Challenge: Look at the two triangles closely. Think about the lengths of each side. What is the missing length? (hint: add two measurements to find the length of the larger triangles side)

• 14

• 21.33

Multiple Select

What is the value of the missing side?

• 5

• 3

• 6.5

• 4.5