#include <cstdio>
#include <cmath>
#include <algorithm>
using namespace std;
const double pi=acos(-1),eps=1e-8;
struct
{
    int x,y;
} p1,p2;
double intsec(double r1,double r2)
{
    double dist=sqrt(pow(p2.x-p1.x,2)+pow(p2.y-p1.y,2));
    if(r1+r2<=dist+eps)
        return 0;
    if(abs(r2-r1)>=dist-eps)
        return pi*pow(min(r2,r1),2);
    double a1 = acos((r1*r1 + dist*dist - r2*r2) / (2.0*r1*dist));
    double a2 = acos((r2*r2 + dist*dist - r1*r1) / (2.0*r2*dist));
    return a1*r1*r1 + a2*r2*r2 - r1*dist*sin(a1);
}
int main()
{
    int T;
    scanf("%d", &T);
    for(int t=1; t<=T; t++)
    {
        double r1,r2;
        scanf("%lf%lf", &r1, &r2);
        scanf("%d%d", &p1.x, &p1.y);
        scanf("%d%d", &p2.x, &p2.y);
        double ans = intsec(r2, r2)+intsec(r1, r1) - intsec(r1, r2)*2;
        printf("Case #%d: %.6f\n",t, ans);
    }
    return 0;
}