Use Pythagorean Theorem
c2 = a2 + b2
152 = a2 + 12 
a2 = 152 - 122 
 =225 - 144 = 81
a = 9 ft
Distance from base of antenna = 9ft
        
             
        
        
        
Answer:
24
Step-by-step explanation:
The base of a triangle 6
The height of the triangle 8
The face of a triangle=(6*8)/2
(6*8)/2=24
 
        
             
        
        
        
First you need to find the middle number, wich is 75. Since there is no $75, I would go with $80.
        
             
        
        
        
Using Pythagoras: 
12^2+5^2= 144+25=169
√169= 13
        
                    
             
        
        
        
It is 015 & with a line and a book o crove hdgsgub