#include<stdio.h>  
#include<math.h>  
#define PI acos(-1.0)  
double sum(double a1,double b1,double r1,double a2,double b2,double r2) 
{
    double A1,A2,s1,s2,s,d;                  
        d=sqrt((a2-a1)*(a2-a1)+(b2-b1)*(b2-b1));
        if(d>=r1+r2)  
            return 0.000;     
        else if(d<=fabs(r1-r2))
        {    
            if(r1>r2)      
                return PI*r2*r2;  
            else     
                return PI*r1*r1;  
        }  
        else{  
      
            A1=2*acos((d*d+r1*r1-r2*r2)/(2*d*r1)); 
            A2=2*acos((d*d+r2*r2-r1*r1)/(2*d*r2));  
            s1=0.5*r1*r1*sin(A1)+0.5*r2*r2*sin(A2);  
            s2=A1/2*r1*r1+A2/2*r2*r2;  
            s=s2-s1;  
            return s; 
        }  
}  
int main()
{
	int t;
	scanf("%d",&t);
	for(int q=1;q<=t;q++)
	{
		double r1,r2,a1,a2,b1,b2;
		scanf("%lf%lf%lf%lf%lf%lf",&r1,&r2,&a1,&b1,&a2,&b2);
		printf("Case #%d: ",q);
		printf("%.6lf\n",sum(a1,b1,r2,a2,b2,r2)-2*sum(a1,b1,r2,a2,b2,r1)+sum(a1,b1,r1,a2,b2,r1));
	}
	return 0;
}