#include "bits/stdc++.h"
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define rrep(i,n) for( int i = n; i >= 0; i-- )
#define REP(i,s,t) for( int i = s; i <= t; i++ )
#define RREP(i,s,t) for( int i = s; i >= t; i-- )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000
#define PI 3.14159265358979

int main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    int T; cin >> T;
    rep(j, T){
        double X[6], Y[6];
        rep(i, 6) {
            cin >> X[i] >> Y[i];
        }
        double ans = 50;
        REP(r, -1, 1) {
            rep(i, 6){
                if (X[i] > -9e-12 && Y[i] > -9e-12 && acos(X[i]+ r * 1e-12)*180/PI <= 50.0) {
                    ans = min(ans, acos(X[i]+ r * 1e-12));
                }
            }
        }
        cout << fixed << setprecision(12) << ans << endl;
    }

    return 0;
}