<span> Use the Law of Cosines, where you have a triangle with included angle of 145 degrees and sides of 16 and 18. You are then solving the equation: </span>
<span>d^2 = 16^2 + 18^2 - 2(16)(18)cos(145)        </span>
        
                    
             
        
        
        
<span>the classification system</span>
        
             
        
        
        
I think it’s R=U/I = 120/5 = 24