/* -*- coding: utf-8 -*-
 *
 * 3672.cc:  No.3672 Volume 3D - yukicoder
 */

#include<cstdio>
#include<cmath>
#include<algorithm>

using namespace std;

/* constant */

const double PI = acos(-1.0);

/* typedef */

/* global variables */

/* subroutines */

double integral(double x0, double r) {
  // int_{x=x0..r} PI*(r^2-x^2)*dx
  // = PI * int_{x=x0..r} (r^2-x^2)dx
  // = PI * (r^2*(r-x0)-(r^3-x0^3)/3)

  double rr = r * r, rrr = rr * r;
  return PI * (rr * (r - x0) - (rrr - x0 * x0 * x0) / 3);
}

/* main */

int main() {
  int tn;
  scanf("%d", &tn);

  while (tn--) {
    int xa, ya, za, ra;
    scanf("%d%d%d%d", &xa, &ya, &za, &ra);
    int xb, yb, zb, rb;
    scanf("%d%d%d%d", &xb, &yb, &zb, &rb);

    int dx = xb - xa, dy = yb - ya, dz = zb - za;
    double d = sqrt(dx * dx + dy * dy + dz * dz);
    if (d >= ra + rb) { puts("0"); continue; }

    int dr = abs(rb - ra), minr = min(ra, rb);
    if (d <= dr) {
      printf("%.12lf\n", PI * 4 / 3 * minr * minr * minr);
      continue;
    }

    // ra^2-la^2=rb^2-lb^2=d^2, la+lb=d -> lb=d-la
    // -> (ra^2-la^2)-(rb^2-(d-la)^2)=0
    // -> ra^2-rb^2-la^2+d^2-2d*la+la^2=0
    // -> (ra^2-rb^2)+d^2-2d*la=0
    // -> la=(d^2+ra^2-rb^2)/2d

    double la = (d * d + ra * ra - rb * rb) / (d * 2);
    double lb = d - la;

    double va = integral(la, ra);
    double vb = integral(lb, rb);

    printf("%.12lf\n", va + vb);
  }

  return 0;
}