Finding Missing Measurements with Scale Factor

What is the first step in finding missing measurements in similar figures?

• Subtract the side lengths of the figures

• Add the side lengths of the figures

• Find the scale factor between the figures

• Divide the side lengths of the figures

If the scale factor from a smaller triangle to a larger triangle is 2, what is the scale factor from the larger triangle to the smaller triangle?

• 4

• 1/4

• 2

• 1/2

Given a pair of corresponding sides 12 and 6, what is the scale factor from the smaller figure to the larger figure?

• 1/2

• 2

• 1/3

• 3

If a side length of a smaller triangle is 2.5 cm and the scale factor to the larger triangle is 2, what is the length of the corresponding side in the larger triangle?

• 10 cm

• 7.5 cm

• 2.5 cm

• 5 cm

What is the length of the side FE if the corresponding side in the larger triangle is 13 cm and the scale factor from the larger to the smaller triangle is 1/2?

• 6.5 cm

• 13 cm

• 3.25 cm

• 26 cm

What is the scale factor if you are going from a smaller rectangle to a larger rectangle and the corresponding side lengths are 7 and 4?

• 1.75

• 2

• 1.5

• 1.25

If the side length PS of a smaller rectangle is 9 cm and the scale factor to the larger rectangle is 7/4, what is the length of the corresponding side in the larger rectangle?

• 10.5 cm

• 15.75 cm

• 14 cm

• 12.5 cm

What is the process to find a missing side length in similar figures?

• Add the known side length to the scale factor

• Divide the known side length by the scale factor

• Multiply the known side length by the scale factor

• Subtract the scale factor from the known side length

If the scale factor from a larger figure to a smaller figure is 1/2, what operation would you perform to find a missing side length in the smaller figure?

• Subtract 1/2 from the known side length

• Add 1/2 to the known side length

• Multiply the known side length by 1/2

• Multiply the known side length by 2

What is the scale factor if the corresponding side lengths of two similar figures are 9 and 4?

• 1.5

• 1.75

• 2.25

• 2