1 #include
     
       2 #include
      
        3 #include
       
         4 #include
        
          5 #include
         
           6 using namespace std; 7  8 int main() 9 {10     //freopen("acm.acm","r",stdin);11     double x1;12     double y1;13     double r1;14     double x2;15     double y2;16     double r2;17     double A;18     double B;19     double d;20     double s;21     double area;22     while(cin>>x1>>y1>>r1>>x2>>y2>>r2)23     {24     d = sqrt((x1 - x2)*(x1 - x2)+(y1 - y2)*(y1 - y2));25     if(r1 < r2)26         iter_swap(&r1,&r2);27     if(d >= r1+r2)28     {29         cout<
          
           <
           
            <<0.0<