#include <iostream>
#include <math.h>
#include <vector>
#include <array>
#include <algorithm>
#include <queue>
#include <numeric>
#include <map>
#include <set>

using namespace std;
#define int long long
#define FOR(i, a, b) for(int i=(a);i<(b);i++)
#define RFOR(i, a, b) for(int i=(b-1);i>=(a);i--)
#define REP(i, n) for(int i=0; i<(n); i++)
#define RREP(i, n) for(int i=(n-1); i>=0; i--)
#define ALL(a) (a).begin(),(a).end()
#define UNIQUE_SORT(l) sort(ALL(l)); l.erase(unique(ALL(l)), l.end());
#define CONTAIN(a, b) find(ALL(a), (b)) != (a).end()
#define array2(type, x, y) array<array<type, y>, x>
#define vector2(type) vector<vector<type> >
#define out(...) printf(__VA_ARGS__)

typedef pair<int, int> pos;
int pos::*x = &pos::first;
int pos::*y = &pos::second;

int dxy[] = {0, 1, 0, -1, 0};

/*================================*/

int T;

signed main()
{
    cin >> T;
    double x, y;
    vector<double> d;
    double diff = 1e-9;
    REP(i,T) REP(j,6) {
        cin >> x >> y;
        if (0.5 + diff < x && x <= 1.0 + diff && y >= - diff) {
            // (1, 0)が回転した
            // 計算して角度を出力
            double rad = atan2(y,  x);
            double theta = rad * 180.0 / M_PI;
            //out("%f, %f -> %f -> %f\n", x, y, rad, theta);
            //if (55 < theta || theta < 0.0) theta = 0.0;
            d.push_back(theta);
        }
    }

    REP(i,T) printf("%.14f\n", d[i]);
    return 0;
}