Answer:

Step-by-step explanation:
ΔABC and ΔADB are similar (AAA).
Therefore the corresponging sides are in proportion:

Substitute:

 <em>cross multiply</em>
       <em>cross multiply</em>

 
        
             
        
        
        
        
Answer:
its C and 4.7x10 -5 was right
Step-by-step explanation:
 
        
             
        
        
        
Answer:the first one opn and qps 
Step-by-step explanation:
 
        
             
        
        
        
Answer:
625 ft^2
Step-by-step explanation:
Given
 --- perimeter
 --- perimeter
Required
The largest area
The perimeter is calculated as:

So, we have:

Divide both sides by 2

Make  L the subject

The area is calculated as:

Substitute 

Open bracket

Differentiate with respect to W

Set to 0; to get the maximum value of W

Collect like terms

Divide by -2

So, the maximum area is:



