Similar Figures Setting Up Proportions

In this pair of figures sides are proportional and angles are congruent.

• Similar Figures

• Ratio

• Unit Rate

• Proportion

• Unit Price

A statement that two ratios are equal and cross products are used to solve for missing amounts.

• Proportion

• Ratio

• Unit Rate

• Unit Price

Polygons that are the same shape but different size.

• Similar Figures

• Ratio

• Unit Rate

• Indirect Measurement

• Proportion

Must have 3 out of 4 measurements from the similar figures to set up and solve a proportion to find missing part (usually the X on the top left ratio in the proportion).

• Indirect Measurement

• Ratio

• Unit Rate

• Unit Price

• Similar Figures

A statement of congruence like ∆DEF ~ ∆GHI shows which sides and angles are corresponding in this pair of figures.

• Unit Price

• Ratio

• Unit Rate

• Similar Figures

• Proportion

When setting this up always line up like amounts across the equal sign: beats/min = beats/min

• Unit Price

• Ratio

• Unit Rate

• Similar Figures

• Proportion

Rectangle ABCD and rectangle EFGD are similar figures. Which of the following proportions is true for the figures?

Triangle ABC and triangle WXY are similar figures. Which of the following proportions is true for the figures?

Maura is building a 24 in tall model of the Gateway Arch in St. Louis, Missouri.  The scale is 3 in : 78.75 ft.  Estimate the height of the actual arch.

• 630

• 600

• 400

• 200

Find missing side

• 5

• 7

• 9

• 11