from math import sqrt, pi

def main():
    T=int(input())
    for i in range(T):
        A,B,C,D=map(int,input().split())
        a,b,c,d=map(int,input().split())
        distance2=(A-a)**2+(B-b)**2+(C-c)**2
        distance=sqrt(distance2)
        if distance2>=(D+d)**2:
            print(0)
        elif distance2<=(D-d)**2:
            print(f"{4*min(D,d)**3*pi/3.0:.10f}")
        else:
            print(f"{pi*(D+d-distance)**2*(distance2+2*distance*(D+d)-3*(D-d)**2)/(12*distance):.10f}")

if __name__=="__main__":
    main()