Decimal form: -2.6666.. 
Fraction form: -2 2/3
        
             
        
        
        
0o----------------------------o5
Step-by-step explanation:
 
        
             
        
        
        
Answer:
 I think a is the answer of this question
 
        
             
        
        
        
Step-by-step explanation:
0.5 ( r + 2.75 ) = 3
r + 2.75 = 3 / 0.5
r + 2.75 = 6
r = 6 - 2.75
r = 3.25
 
        
                    
             
        
        
        
200×180 =36,000
36,000 / pi (approx 3.14)= 11,459.1559026