#include <bits/stdc++.h>

using namespace std;

#define int long long
#define pb push_back
#define mp make_pair
#define pi pair<int,int>
#define f first
#define s second
#define lep(i,a,b) for (int i=(a); i <= (b); i++)
#define rep(i,b,a) for (int i = (b); i >= (a); i--)

typedef long double D;

const int inf = 1e12;
const D large_val = 1e50;

#define EPS 1e-12

signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    int n;
    cin >> n;
    D l = 0;
    D r = inf;
    vector<int> x(n+1),y(n+1),vx(n+1),vy(n+1);
    lep(i,1,n) {
        cin >> x[i] >> y[i] >> vx[i] >> vy[i];
    }
    auto F = [&](D t) -> D {
        D minx = large_val;
        D maxx = -large_val;
        D miny = large_val;
        D maxy = -large_val;
        lep(i,1,n) {
            D xval = D(x[i]) + D(t) * D(vx[i]);
            D yval = D(y[i]) + D(t) * D(vy[i]);
            minx = min(minx, xval);
            miny = min(miny, yval);
            maxx = max(maxx, xval);
            maxy = max(maxy, yval);
        }
        D ans = (maxy - miny) * (maxx - minx);
        // cout << "t: " << t << ", ans: " << ans << "\n";
        return ans;
    };
    // cout << fixed << setprecision(10);
    // while (r - l > EPS) {
    //     cout << "l: " << l << ", r: " << r << "\n";
    lep(it,1,100) {
        D dif = r - l;
        D m1 = l + dif * D(.49);
        D m2 = l + dif * D(.51);
        D ans1 = F(m1);
        D ans2 = F(m2);
        if (ans1 > ans2) l = m1;
        else r = m2;
    }
    cout << fixed << setprecision(10) << F(l) << "\n";

}