Review Lesson

Review

Multiple Choice

Which of the following is a proportion?

• $3:4\ and\ \ \ 4:3$

• $2:3\ and\ 4:6$

Which of the following is a proportion?

Mean and Extremes
- Two ratios are proportion, if the product of the means is equal to the product of the extremes.

 $3:4=4:3$              $2:3=4:6$  
 $16\ne9$                            $12=12$  

Multiple Choice

Solve for the value of x in the proportion  $\frac{2x}{3}=\frac{x+7}{5}$  ?

• x=7

• x=3

In finding the unknown in proportion, we use Cross Product Property.

 $\frac{2x}{3}=\frac{x+7}{5}$  
 $10x=3\left(x+7\right)$  
 $10x=3x+21$  
 $10x-3x=21$  
 $7x=21$   $x=3$  

Multiple Choice

 $\Delta ABC\cong\Delta DEF$  , which side corresponds to  $\overline{AC}$  ?

•  $\overline{DE}$  

•  $\overline{DF}$  

Multiple Choice

Given the figures, what is the ratio of the length of  $\overline{AP}$  to  $\overline{CM}$  ?

• 3:1

• 1:3