#include <bits/stdc++.h>
using namespace std;
#define GET_MACRO(a, b, c, NAME, ...) NAME
#define rep(...) GET_MACRO(__VA_ARGS__, rep3, rep2)(__VA_ARGS__)
#define rep2(i, a) rep3 (i, 0, a)
#define rep3(i, a, b) for (int i = (a); i < (b); i++)
#define repr(...) GET_MACRO(__VA_ARGS__, repr3, repr2)(__VA_ARGS__)
#define repr2(i, a) repr3 (i, 0, a)
#define repr3(i, a, b) for (int i = (b) - 1; i >= (a); i--)
template<class T1, class T2> inline bool chmin(T1 &a, T2 b) { return b < a && (a = b, true); }
template<class T1, class T2> inline bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }
using ll = long long;

using ld = long double;
const ld pi = acos(-1);

int main() {
	int T;
	cin >> T;

	rep (i_, T) {
		cin.ignore();
		ld x, y;

		rep (i, 6) {
			ld tx, ty;
			cin >> tx >> ty;
			if (i == 0) x = tx, y = ty;
		}

		ld ans = atan2(y, x) / pi * 180;
		ans = fmod(ans, 60);
		ans += 60;
		ans = fmod(ans, 60);
		if (ans >= 51) ans -= 60;
		printf("%.20f\n", (double)ans);
	}
	return 0;
}