#include <bits/stdc++.h>
using namespace std;
const int MAXN = 100005;
const long double eps = 1e-18;
int n, q, x[MAXN], y[MAXN];
pair<long double, long double> pt[MAXN];
bool vis[MAXN];
struct Convex {
    int stk1[MAXN], top1;
    int stk2[MAXN], top2;
    long double cross(int i, int j, int k) {
        return (pt[j].first - pt[i].first) * (pt[k].second - pt[i].second)
             - (pt[k].first - pt[i].first) * (pt[j].second - pt[i].second);
    }
    void build() {
        for (int i = 1; i <= n; i++) if (!vis[i]) {
            while (top1 > 1 && cross(stk1[top1 - 1], stk1[top1], i) >= -eps) top1--;
            stk1[++top1] = i;
        }
        for (int i = 1; i <= n; i++) if (!vis[i]) {
            while (top2 > 2 && cross(stk2[top2 - 1], stk2[top2], i) <= eps) top2--;
            stk2[++top2] = i;
        }
        for (int i = 1; i <= top1; i++) vis[stk1[i]] = 1;
        for (int i = 1; i <= top2; i++) vis[stk2[i]] = 1;
    }
    vector<int> query(long double cos, long double sin) {
        if (!top1) return {};
        vector<int> ret;
        for (int i = 1; i <= min(5, top1); i++) ret.push_back(stk1[i]);
        for (int i = 1; i <= min(5, top2); i++) ret.push_back(stk2[i]);
        for (int i = max(1, top1 - 4); i <= top1; i++) ret.push_back(stk1[i]);
        for (int i = max(1, top2 - 4); i <= top2; i++) ret.push_back(stk2[i]);
        if (sin >= 0) {
            int l = 1, r = top1;
            while (l < r - 2) {
                int mid1 = (l + r) >> 1, mid2 = mid1 + 1;
                if (pt[stk1[mid1]].first * cos + pt[stk1[mid1]].second * sin
                  < pt[stk1[mid2]].first * cos + pt[stk1[mid2]].second * sin) {
                    l = mid1;
                } else {
                    r = mid2;
                }
            }
            for (int i = max(1, l - 4); i <= min(r + 4, top1); i++) ret.push_back(stk1[i]);
        } else {
            int l = 1, r = top2;
            while (l < r - 2) {
                int mid1 = (l + r) >> 1, mid2 = mid1 + 1;
                if (pt[stk2[mid1]].first * cos + pt[stk2[mid1]].second * sin
                  < pt[stk2[mid2]].first * cos + pt[stk2[mid2]].second * sin) {
                    l = mid1;
                } else {
                    r = mid2;
                }
            }
            for (int i = max(1, l - 4); i <= min(r + 4, top2); i++) ret.push_back(stk2[i]);
        }
        sort(ret.begin(), ret.end());
        ret.erase(unique(ret.begin(), ret.end()), ret.end());
        return ret;
    }
} convex[6];
int main() {
    // freopen("E.in", "r", stdin);
    // freopen("E.out", "w", stdout);
    scanf("%d", &n);
    for (int i = 1; i <= n; i++) {
        scanf("%d%d", &x[i], &y[i]);
        long long p = 1ll * x[i] * x[i] + 1ll * y[i] * y[i];
        pt[i] = { 2.0l * x[i] / p, 2.0l * y[i] / p };
    }
    sort(pt + 1, pt + 1 + n);
    for (int i = 1; i <= 5; i++) convex[i].build();
    scanf("%d", &q);
    while (q--) {
        int x, y, k; scanf("%d%d%d", &x, &y, &k);
        if (x == 0 && y == 0) {
            printf("-1\n");
            continue;
        }
        long double d = sqrtl(1ll * x * x + 1ll * y * y);
        long double c = x / d, s = y / d;
        vector<int> p;
        for (int i = 1; i <= 5; i++) {
            for (int j : convex[i].query(c, s)) p.push_back(j);
        }
        sort(p.begin(), p.end());
        p.erase(unique(p.begin(), p.end()), p.end());
        vector<long double> ans;
        for (int i : p) ans.push_back(c * pt[i].first + s * pt[i].second);
        sort(ans.begin(), ans.end(), greater<>());
        if (ans.size() < k || ans[k - 1] < eps) printf("-1\n");
        else printf("%.12Lf\n", 1 / ans[k - 1]);
    }
    return 0;
}