#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return true; } return false; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return true; } return false; }
#define vi vector<int>
#define vl vector<ll>
#define vii vector<pair<int,int>>
#define vll vector<pair<ll,ll>>
#define vvi vector<vector<int>>
#define vvl vector<vector<ll>>
#define vvii vector<vector<pair<int,int>>>
#define vvll vector<vector<pair<ll,ll>>>
#define vst vector<string>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pb push_back
#define all(x) (x).begin(),(x).end()
#define mkunique(x) sort(all(x));(x).erase(unique(all(x)),(x).end())
#define fi first
#define se second
#define mp make_pair
#define si(x) int(x.size())
const int mod=998244353,MAX=300005,INF=15<<26;

// https://mathworld.wolfram.com/Sphere-SphereIntersection.html

#define ld long double

int main(){
    
    std::ifstream in("text.txt");
    std::cin.rdbuf(in.rdbuf());
    cin.tie(0);
    ios::sync_with_stdio(false);
    
    int Q;cin>>Q;
    while(Q--){
        ll x1,y1,z1,RR;cin>>x1>>y1>>z1>>RR;
        ll x2,y2,z2,rr;cin>>x2>>y2>>z2>>rr;
        if(RR<rr){
            swap(x1,x2);
            swap(y1,y2);
            swap(z1,z2);
            swap(RR,rr);
        }
        ld R=RR,r=rr;
        ld d=hypotl(hypotl(x1-x2,y1-y2),z1-z2);
        //cout<<R<<" "<<r<<" "<<d<<" ";
        
        ld pi=acosl(-1.0l);
        if(d+r<=R){
            ld V=pi*4*r*r*r/3;
            cout<<fixed<<setprecision(25)<<V<<"\n";
        }else if(R+r<d) cout<<0<<"\n";
        else{
            ld pi=acosl(-1.0l);
            ld V=pi*(R+r-d)*(R+r-d)*(d*d+2*d*r-3*r*r+2*d*R+6*r*R-3*R*R);
            V/=(12*d);
            cout<<fixed<<setprecision(25)<<V<<"\n";
        }
    }
}