#include <bits/stdc++.h>
#define ll long long
#define db long double
#define x first
#define y second
#define mp make_pair
#define pb push_back
#define all(a) a.begin(), a.end()

using namespace std;

const db EPS = 1e-8;
const db PI = acos(-1);

db get_angle(db a, db b, db c) {
	db top = a * a + b * b - c * c;
	db bot = 2 * a * b;
	return acos(top / bot);
}

db area(db xa, db ya, db ra, db xb, db yb, db rb) {
	if (ra < rb) {
		swap(xa, xb);
		swap(ya, yb);
		swap(ra, rb);
	}
	db d = sqrt((xa - xb) * (xa - xb) + (ya - yb) * (ya - yb));
	if (d + EPS > ra + rb) {
		return 0;
	}
	if (ra + EPS > d + rb) {
		return PI * rb * rb;
	}
	db res = 0;
	db alp = 2 * get_angle(ra, d, rb);
	res += alp * ra * ra;
	res -= 0.5 * ra * ra * abs(sin(alp));
	cout << d << " " << ra << "\n";
	if (d + EPS > ra) {
		db beta = 2 * get_angle(rb, d, ra);
		res += beta * rb * rb;
		res -= 0.5 * rb * rb * abs(sin(beta));
	} else {
		db beta = 2 * PI - 2 * get_angle(d, rb, ra);
		res -= beta * rb * rb;
		res += 0.5 * rb * rb * abs(sin(beta));
	}
	return res;
}

void solve() {
	int r, R;
	cin >> r >> R;
	int xa, ya, ra, Ra, xb, yb, rb, Rb;
	cin >> xa >> ya >> xb >> yb;
	ra = r, rb = r;
	Ra = R, Rb = R;
	db res = area(xa, ya, Ra, xb, yb, Rb);
	res -= area(xa, ya, ra, xb, yb, Rb);
	res -= area(xa, ya, Ra, xb, yb, rb);
	res += area(xa, ya, ra, xb, yb, rb);
	cout.precision(20);
	cout << res << "\n";
}

int main(){
#ifdef LOCAL
	freopen("M_input.txt", "r", stdin);
	//freopen("M_output.txt", "w", stdout);
#endif
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int t;
	cin >> t;
	for (int i = 0; i < t; i++) {
		solve();
	}
}