牛牛的装球游戏

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#include
using namespace std;
#define int long long
double pi=3.141592653589;
signed main(){
    // std::ios::sync_with_stdio(0);
    // cin.tie(0),cout.tie(0);
    int T;
    cin>>T;
    while(T--){
        double r,h;
        cin>>r>>h;
        double sum=1.0*(pi*r*r)*h;
        int k=1.0*h/(r*2);
        double q=(4.0/3)*pi*r*r*r*k;
        printf("%.3lf\n",sum-q);
    }


    return 0;
}