#include<bits/stdc++.h>
#define pi 3.14159265359

using namespace std;



int main()
{
    double w,x1,y1,x,t;
    int tt;
    scanf("%d",&tt);
    for(int kk1=1;kk1<=tt;kk1++)
    {
        scanf("%lf%lf%lf%lf%lf",&x1,&y1,&x,&w,&t);
        double thet;
        bool fg =false;
        thet = t*w;
        if(thet<0.0)
        {
            fg = true;
            thet = thet*(-1.0);
        }
        double d,r;
        r = sqrt((x1*x1)+(y1*y1));
        d = sqrt(((x1-x)*(x1-x))+((y1-0)*(y1-0)));
        double th1,th2;
        th1 = (180.00*thet)/pi;
        th2 = acos((-d*d+x*x+r*r)/(2.00*x*r));
        double rad;
        th2 = (180.00*th2)/pi;
        if(fg)
        th1 = th2-th1;
        else
        th1 = th2+th1;
        rad = (pi*th1)/180.00;
   //     cout<<th1<<endl;
   //     cout<<cos(rad)<<endl;
        double a,b,c;
        b=2.00*r*cos(rad);
        a=1.00;
        c=(-1.0)*(d*d-r*r);
        b=b*(-1);

//        cout<<a<<" "<<b<<" "<<c<<endl;
        double ans1,ans2;
        ans1 = (-b+sqrt(b*b-4.00*a*c))/2.00*a;
        ans2 = (-b-sqrt(b*b-4.00*a*c))/2.00*a;

 //       cout<<ans1<<"  "<<ans2<<endl;
        ans1 =max(ans1,ans2);
        printf("Case %d: ",kk1);

        printf("%.10lf\n",ans1);




    }


}