triangle partitioning

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int tc, caseino = 0;
    double AB, AC, BC, AD, r;
    cin >> tc;
    while(tc--)
    {
        cin >> AB >> AC >> BC >> r;
        double x =sqrt( 1.0 + 1.0 / r);
        printf("Case %d: %lf\n", ++caseino, AB / x);
    }
    return 0;
}