#include <bits/stdc++.h>
using namespace std;

static long double intersectionVolume(
    long long xa, long long ya, long long za, long long ra_i,
    long long xb, long long yb, long long zb, long long rb_i
) {
    const long long dx_i = xa - xb;
    const long long dy_i = ya - yb;
    const long long dz_i = za - zb;

    const __int128 d2_integer =
        static_cast<__int128>(dx_i) * dx_i
        + static_cast<__int128>(dy_i) * dy_i
        + static_cast<__int128>(dz_i) * dz_i;
    const long long sum_i = ra_i + rb_i;
    const long long diff_i = llabs(ra_i - rb_i);
    const __int128 sum2_integer = static_cast<__int128>(sum_i) * sum_i;
    const __int128 diff2_integer = static_cast<__int128>(diff_i) * diff_i;

    const long double ra = static_cast<long double>(ra_i);
    const long double rb = static_cast<long double>(rb_i);
    const long double pi = acosl(-1.0L);

    if (d2_integer >= sum2_integer) {
        return 0.0L;
    }
    if (d2_integer <= diff2_integer) {
        const long double r = min(ra, rb);
        return 4.0L * pi * r * r * r / 3.0L;
    }

    const long double d2 = static_cast<long double>(d2_integer);
    const long double d = sqrtl(d2);
    const long double sum_r = ra + rb;

    // sum_r - d を直接計算すると、外接直前で有効桁を失う。
    const long double overlap_depth =
        (sum_r * sum_r - d2) / (sum_r + d);
    const long double radius_difference = ra - rb;
    const long double bracket =
        d2 + 2.0L * d * sum_r
        - 3.0L * radius_difference * radius_difference;

    long double answer =
        pi * overlap_depth * overlap_depth * bracket / (12.0L * d);
    if (answer < 0.0L && answer > -1e-18L) answer = 0.0L;
    return answer;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int T;
    cin >> T;
    cout << scientific << setprecision(20);

    for (int test_case = 0; test_case < T; ++test_case) {
        long long xa, ya, za, ra;
        long long xb, yb, zb, rb;
        cin >> xa >> ya >> za >> ra;
        cin >> xb >> yb >> zb >> rb;
        cout << intersectionVolume(xa, ya, za, ra, xb, yb, zb, rb) << '\n';
    }
    return 0;
}