Answer:
3 30303/125000
Step-by-step explanation:
 
        
             
        
        
        
Answer:
60
Step-by-step explanation:
perimeter (p) = 8 + 17 + 15 = 40
semi-perimeter (s) = p/2 = 20
Area = square root of s(s-a)(s-b)(s-c) where a,b,c are the sides of the triange by Herons formula.
Therefore, area = 20(20-8)(20-15)(20-17) = square root of 3600 = 60
 
        
             
        
        
        
Answer:
The Height of the tower is 188.67 ft
Step-by-step explanation:
Given as :
The angle of elevation to tower = 15° 
The distance travel closer to tower the elevation changes to 42° = 497 ft
Now, Let the of height of tower = h  ft
The distance between 42°  and  foot of tower = x  ft
So, The distance between 15° and  foot of tower =  ( x + 497 )  ft 
So, From figure : 
<u>In Δ ABC </u> 
Tan 42° =  
 
Or , Tan 42° =  
 
Or,  0.900 =  
 
∴ h = 0.900 x 
Again : 
<u>In Δ ABD </u> 
Tan 15° =  
 
Or , Tan 15° =  
 
Or,  0.267 =  
 
Or,  h = ( x + 497 ) × 0.267
So, from above two eq  : 
      0.900 x =  ( x + 497 ) × 0.267  
Or, 0.900 x - 0.267 x =  497  × 0.267  
So, 0.633 x = 132.699 
∴               x = 
Or,            x = 209.63  ft 
So, The height of tower = h = 0.900 × 209.63 
Or,                                      h = 188.67 ft
Hence The Height of the tower is 188.67 ft    Answer 
 
        
             
        
        
        
Step-by-step explanation:
A=140sq. units