#include <cstdio>
#include <cmath>
#include <algorithm>
using namespace std;
int main()
{
    int T; scanf("%d", &T);
    while (T--) {
        vector<double> v;
        for(int i=0;i<6;++i) {
            double x, y;
            scanf("%lf%lf", &x, &y);
            v.emplace_back(atan2(y, x));
        }
        sort(begin(v), end(v));
        double res=v[0]*180/acos(-1);
        if (res<0) res+=180;
        if (fabs(60-res)<1e-6) res=0;
        printf("%.10f\n", res);
    }
}