#include <iostream>
#include <vector>
#include <algorithm>
#include <iomanip>
using namespace std;

#define RREP(i,s,e) for (i = e-1; i >= s; i--)
#define rrep(i,n) RREP(i,0,n)
#define REP(i,s,e) for (i = s; i < e; i++)
#define rep(i,n) REP(i,0,n)
#define INF 1e8

typedef long long ll;

int main() {
    int i, j, t;
    cin >> t;
    cout << fixed << setprecision(7);
    rep (i,t) rep (j,6) {
        double x, y;
        cin >> x >> y;
        if (y+1e-11 >= 0 && x-1e-11 > 0.5)
            cout << atan2(abs(y),x)*180/M_PI << endl;
    }
    return 0;
}