#include<bits/stdc++.h>
using namespace std;
#define int long long
const double pi=acos(-1.0);
void solve(){
    int l1,l2,alp,bet;
    cin>>l1>>l2>>alp>>bet;
    double f=(l1+l2)*(l1+l2)*1.0*pi/180.0*alp*1.0;
    double g=l2*l2*1.0*pi/180.0*bet*1.0;
    cout<<fixed<<setprecision(10)<<f+g<<"\n";
}
signed main(){
    int t;
    cin>>t;
    while(t--)solve();
    return 0;
}