1216 - Juice in the Glass

#include<bits/stdc++.h>
using namespace std;
 
int main()
{
    int T,c=1;
    double r1,r2,h,p;
//    freopen("check.txt","r",stdin);
    scanf("%d",&T);
    while(T--)
    {
        scanf("%lf%lf%lf%lf",&r1,&r2,&h,&p);
        double result, rm = r2+(((r1-r2)*p)/h);
        result = ((2*acos(0.0)*p*((rm*rm*rm)-(r2*r2*r2)))/(3*(rm-r2)));
        printf("Case %d: %.10lf\n",c++,result);
    }
    return 0;
}