Ratios and Scale Factor

The figures below are similar. The labeled sides are corresponding.

What is the perimeter of the smaller triangle?

• 23.8 mm

• 10.2 mm

• 6.67 mm

• 4.3 mm

What is the scale factor? (small to large)

• 2

• 3/2

• 2/3

• 1/2

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

• x = 20

• x = 12

• x = 5

• x = 4

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

• x = 10

• x = 4

• x = 2

• x = 5

Find the ratio (red to blue) of the perimeter.

• 9/14

• 14/9

• 196/81

• 81/196

The figures below are similar. The labeled sides are corresponding.

What is the area of the larger square?

• 25 m²

• 1.25 m²

• 20 m²

• 16 m²

Are the following similar?
Why or why not?

• Yes

• No, the corresponding angles are not equal.

• No, corresponding sides are NOT in proportion.

• i dont know

Definition: The ratio that compares an actual measurement with a model measurement

• Scale

• Distribute

• Cross-Multiply

• Scale factor

Definition: a comparison of two values, expressed with a colon, the word "to," or as a fraction

• Ratio

• Equivalent Ratio

• Proportion

• Variable

Definition: A ratio used to compare measurements when modeling a large quantity

• Scale

• Distribute

• Cross-Multiply

• Scale factor