#include <bits/stdc++.h>
using namespace std;

int main()
{

int t;
cin>>t;
int cse=0;
while(t--){
     cse++;
    double a, b, c,sidea=0,sideb=0,sidec=0,areatriangle=0,areacircle=0,sum=0,s=0,anglea=0,angleb=0,anglec=0,sectora=0,sectorb=0,sectorc=0;
    cin >> a >> b >> c;
    sidea = a + b;
    sideb = a + c;
    sidec = b + c;
    s = (sidea + sideb + sidec) / 2;
    areatriangle = sqrt(s * (s - sidea) * (s - sideb) * (s - sidec));
    // cout << s << " s " << areatriangle << " areatriangle" << endl;
    anglea = (((sideb * sideb + sidec * sidec) - sidea * sidea) / (2 * sideb * sidec));
    // cout << "anglea " << anglea << endl;
    angleb = (((sidea * sidea + sidec * sidec) - sideb * sideb) / (2 * sidea * sidec));
    // cout << "angleb " << angleb << endl;
    anglec = (((sideb * sideb + sidea * sidea) - sidec * sidec) / (2 * sideb * sidea));
    // cout << "anglec " << anglec << endl;
    sectora = ((a*a)*(acos(anglea))*0.5);
    sectorb = ((b*b)*(acos(angleb))*0.5);
    sectorc = ((c*c)*(acos(anglec))*0.5);
    sum = areatriangle - (sectora + sectorb + sectorc);
    cout<<"Case "<<cse<<": "<<fixed<<setprecision(10)<<sum<<endl;
   
}
    return 0;
}