Answer:
hihihihihihiihihihihihihihihihihihiihihihihihihihiihihihihihi
Step-by-step explanation:
i really know like omg please give brainlest
 
        
             
        
        
        
See the picture to better understand the problem
we know that
in the triangle ABC
∠A+∠B+∠C=180°
∠C=180-(86+69)-----> ∠C=25°
Applying the law of sines
b/sin B=c/sin C------> b=c*sin B/sin C-----> b=82*sin 69/sin 25
b=181.14 ft
the answer is181.14 ft
 
        
        
        
SOLUTION
Let us use a simple diagram to interprete the question 
In the diagram above, the dark stuff below represents the shadow and the rectangular bar represents the building. I have labelled the height of the building as h. 
So we will use the right-angled triangle formed to find h
As we can see h represents the opposite side and 56.5 feet represents the adjacent side of the right-angle triangle. So we will use TOA

So we have 

Hence the answer is 104.9 feet to the nearest tenth
 
        
             
        
        
        
if we name that part x, then we can say
1/x = 1/a + 1/b