Answer:
hlo ji good evening ji please follow me
 
        
             
        
        
        
You just need to know that all sides need to have the same measurement because it is a equilateral triangle. 
        
                    
             
        
        
        
Answer:
The answer is 12.5cm
Step-by-step explanation:
cos 52= 7.7/AC
AC= 7.7/ cos 52
AC= 12.5
 
        
             
        
        
        
In the 5/4 = ?/12 .. you have to solve if 4 goes into 12 that is 3. 4•3 equals 12. Now you have to multiply 5•3 and it will fill in your blank space. I hope this Helps.
        
                    
             
        
        
        
X=log36/(2*log15)
X=aprox 0.6616