Proportions and Similar Figures

What is a proportion?

• When two ratios can be simplified

• When two ratios are equivalent and show the same value

• When two ratios have the exact same numbers

• When two ratios can be multiplied by 2

Matching sides are called

• Corresponding Sides

• Corresponding Angles

• The Same

• Congruent Sides

Sides in similar figures must be proportional.  

• True

• False 

Two objects that are the same shape but not the same size are _______.

• Congruent

• Vertical

• Similar

• Complementary 

 $\frac{x}{5}=\frac{8}{10}$  

• x=7

• x=4

• x=2

• x=3

 $\frac{25}{1}=\frac{x}{3}$  

• x=75

• x=50

• x=27

• x=43

 $\frac{15}{25}=\frac{18}{x}$  

• x=28

• x=10

• x=30

• x=11

Which proportion is true?

• $\frac{6}{2.5}=\frac{x}{21}$

• $\frac{6}{2.5}=\frac{21}{x}$

• $\frac{6}{21}=\frac{x}{2.5}$

• $\frac{6}{x}=\frac{2.5}{21}$

What is the constant of proportionality?

• $3

• $4

• $2

• $9

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

• x = 10

• x = 4

• x = 2

• x = 5