#include <iostream>
#include <cstdio>
#include <cmath>

using namespace std;

double theta(double a,double b,double c)
{
    double ang=0;
    ang += acos(((a*a)+(b*b)-(c*c))/(2*a*b));
    return ang;
}

int main()
{
    int tc,c=1;
    cin >> tc;
    while(tc--)
    {
        double r1,r2,r3,x,y,z;
        cin >> r1 >> r2 >> r3;
        x = r1+r2;
        y = r2+r3;
        z = r1+r3;
        double peri_tri, s;
        peri_tri = x+y+z;
        s = peri_tri/2;
        double area_t = 0;
        area_t += sqrt(s*(s-x)*(s-y)*(s-z));
        double sector_c = 0;
        sector_c += (.5*r1*r1*theta(x,y,z))+(.5*r2*r2*theta(y,z,x))+(.5*r3*r3*theta(x,z,y));
        double area_d = 0;
        area_d += area_t - sector_c;
        printf("Case %d: %lf\n",c++,area_d);
    }
    return 0;
}