#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int tt;
  cin >> tt;
  cout << fixed << setprecision(16);
  while (tt--) {
    double x1, y1, r1, x2, y2, r2;
    cin >> x1 >> y1 >> r1 >> x2 >> y2 >> r2;
    double dx = x2 - x1, dy = y2 - y1;
    double d2 = dx * dx + dy * dy;
    double ra = r1 + r2, rs = r1 - r2;
    double tmp1 = r1 * sqrt(d2 - ra * ra);
    double tmp2 = r1 * sqrt(d2 - rs * rs);
    double ans = 0;
    for (auto [a, b] : {
      pair((dx * ra * r1 + dy * r1 * tmp1) / d2, (dy * ra * r1 - dx * r1 * tmp1) / d2),
      pair((dx * ra * r1 - dy * r1 * tmp1) / d2, (dy * ra * r1 + dx * r1 * tmp1) / d2),
      pair((dx * rs * r1 + dy * r1 * tmp2) / d2, (dy * rs * r1 - dx * r1 * tmp2) / d2),
      pair((dx * rs * r1 - dy * r1 * tmp2) / d2, (dy * rs * r1 + dx * r1 * tmp2) / d2)
    }) {
      // a(x-x1)+b(y-y1)=r1^2
      double c = -(a * x1 + b * y1 + r1 * r1);
      double mx = 0;
      for (auto x : {a, b, c}) chmax(mx, abs(x));
      ans += abs(a + b + c) / mx;
    }
    cout << ans << '\n';
  }
}