import sys
from math import pi

from typing import List, Tuple

int1 = lambda x: int(x) - 1
input = lambda: sys.stdin.readline().rstrip('\n')
ii = lambda: int(input())
vi = lambda: list(map(int, input().split()))
vi1 = lambda: list(map(int1, input().split()))


def dbg(*args, **kwargs):
    print(*(repr(arg) for arg in args), *(f'{k}: {repr(v)}' for k, v in kwargs.items()),
          sep='; ', file=sys.stderr, flush=True)


def main():
    t = ii()
    for _ in range(t):
        xa, ya, za, ra = vi()
        xb, yb, zb, rb = vi()
        d2 = (xa - xb) ** 2 + (ya - yb) ** 2 + (za - zb) ** 2
        if d2 <= (ra - rb) ** 2:
            print(4 / 3 * min(ra, rb) ** 3 * pi)
            continue
        if d2 >= (ra + rb) ** 2:
            print(0)
            continue
        ca = (d2 + ra ** 2 - rb ** 2) / (2 * d2 ** 0.5 * ra)
        cb = (d2 + rb ** 2 - ra ** 2) / (2 * d2 ** 0.5 * rb)

        print(ra ** 3 * pi * (2 / 3 + (-ca + ca ** 3 / 3)) + rb ** 3 * pi * (2 / 3 + (-cb + cb ** 3 / 3)))


def _start():
    if (ret := main()) is not None:
        print(*ret) if isinstance(ret, List) or isinstance(ret, Tuple) else print(ret)


if __name__ == '__main__':
    _start()