#include<algorithm>
#include<cmath>
#include<cstdio>
#include<cstring>
#include<queue>
#include<vector>
namespace IO{
	const int ARR_SIZE=1<<20;
	#define gc() ((IO::si!=IO::ti||(IO::ti=(IO::si=IO::input)+fread(IO::input,1,IO::ARR_SIZE,stdin))),IO::si!=IO::ti?*(IO::si++):EOF)
	char input[ARR_SIZE],*si=input,*ti=input;
	template<typename T>
	void read(T&num){
		bool flag=true;
		int ch=gc();
		num=0;
		while(ch<48||ch>57){
			if(ch=='-')flag=false;
			ch=gc();
		}
		while(ch>=48&&ch<=57)num=num*10+(ch^48),ch=gc();
		flag||(num=-num);
	}
}
using IO::read;
typedef double real;
const int maxn=100000,maxk=5;
const real eps=1e-16;
int n,q;
struct Vector{
	real x,y;
	Vector(const real x=0,const real y=0):x(x),y(y){}
	friend bool operator<(const Vector&A,const Vector&B){
		return A.x!=B.x?A.x<B.x:A.y<B.y; 
	}
	friend Vector operator-(const Vector&A,const Vector&B){
		return Vector(A.x-B.x,A.y-B.y);
	}
	friend Vector operator/(const Vector&A,const real&x){
		return Vector(A.x/x,A.y/x);
	}
	friend real Cross(const Vector&A,const Vector&B){
		return A.x*B.y-A.y*B.x;
	}
	friend real Dot(const Vector&A,const Vector&B){
		return A.x*B.x+A.y*B.y;
	}
	Vector rotate_90(){
		return Vector(-y,x);
	}
}P[maxn],Q;
bool used[maxn];
std::vector<int>down[maxk],up[maxk],stack;
void PolygonToConvex(std::vector<int>&down,std::vector<int>&up,std::vector<int>&stack){
	int end=n-1;
	while(end>=0&&used[end])end--;
	if(end==-1)return;
	stack.resize(n*2);
	int top=-1;
	for(int i=0;i<=end;i++){
		if(used[i])continue;
		while(top>0&&Cross(P[stack[top]]-P[stack[top-1]],P[i]-P[stack[top]])<=0)top--;
		stack[++top]=i;
	}
	const int k=top;
	for(int i=end-1;i>=0;i--){
		if(used[i])continue;
		while(top>k&&Cross(P[stack[top]]-P[stack[top-1]],P[i]-P[stack[top]])<=0)top--;
		stack[++top]=i;
	}
	stack.resize(top+1);
	for(int i:stack)used[i]=true;
	down.assign(stack.begin(),stack.begin()+k+1);
	if(k<top)up.assign(stack.begin()+k+1,stack.begin()+top+1);
}
int k;
real DotPQ[maxn];
struct CMP{
	bool operator()(const int x,const int y)const{
		return DotPQ[x]>DotPQ[y];
	}
}cmp;
std::priority_queue<int,std::vector<int>,CMP>queue;
int vis[maxn],now_id;
void push(const int x){
	if(vis[x]==now_id)return;
	vis[x]=now_id;
	if((DotPQ[x]=Dot(P[x],Q))<=eps)return;
	queue.push(x);
	if((int)queue.size()>k)queue.pop();
}
void solve(std::vector<int>&vec,const bool flag,const int k){
	if((int)vec.size()<=k)
		for(int i:vec)
			push(i);
	else{
		if(flag){
			int l=0,r=(int)vec.size()-2,mid;
			while(l<r){
				mid=(l+r)>>1;
				if(Dot(Q,P[vec[mid+1]]-P[vec[mid]])<0)r=mid;
				else l=mid+1;
			}
			for(int i=std::max(0,l-k),lim=std::min((int)vec.size()-1,l+k);i<=lim;i++)push(vec[i]);
		}else{
			for(int i=0;i<k;i++)push(vec[i]);
			for(int i=(int)vec.size()-k;i<(int)vec.size();i++)push(vec[i]);
		}
	}
}
int main(){
	read(n);
	for(int i=0;i<n;i++)read(P[i].x),read(P[i].y),P[i]=P[i]/Dot(P[i],P[i]);
	std::sort(P,P+n);
	for(int i=0;i<maxk;i++)PolygonToConvex(down[i],up[i],stack);
	read(q);
	memset(vis,-1,sizeof(int)*n);
	for(int i=0,x,y;i<q;i++){
		now_id=i;
		read(x),read(y),read(k);
		if(x==0&&y==0){
			puts("-1");
			continue;
		}
		Q=Vector(x,y);
		while(!queue.empty())queue.pop();
		for(int j=0;j<k;j++)solve(down[j],y<0,k-j);
		for(int j=0;j<k;j++)solve(up[j],y>0,k-j);
		if((int)queue.size()<k)puts("-1");
		else printf("%.7lf\n",(real)0.5*sqrt(Dot(Q,Q))/Dot(P[queue.top()],Q));
	}
	return 0;
}