#include<iostream>
#include<vector>
#include<algorithm>
#include<iomanip>
#include<cmath>
using namespace std;
typedef long long ll;
typedef long double ld;
const ld PI = 2*acos(ld(0));
ld angle(ld x, ld y)
{
	if (x == 0)
	{
		if (y > 0)
			return PI / 2;
		return -PI / 2;
	}
	if (x > 0)
		return atan(ld(y) / x);
	else
		if (y < 0)return -PI + atan(ld(y) / x);
		else
			return PI + atan(ld(y) / x);
}
ld len(ld x, ld y)
{
	return sqrt(x * x + y * y);
}
const int N = 100010;

int r[N];
ld a[N];
ld len2(ld alpha, ld r, ld x, ld y)
{
	ld dx = r * cos(alpha), dy = r * sin(alpha);
	return len(dx - x, dy - y);
}
signed main()
{
	//cout << PI;
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int rr, ff, tt;
	cin >> rr >> ff >> tt;
	for (int i = 1; i <= rr; i++)
		cin >> r[i];
	sort(r + 1, r + rr + 1);
	r[0] = -1e8;
	r[rr + 1] = 1e8;
	for (int i = 1; i <= ff; i++)
	{
		int x, y; cin >> x >> y;
		a[i] = angle(x, y);
		//cout << x << ' ' << y << ' ' << a[i] << '\n';
	}
	sort(a + 1, a + ff + 1);
	a[ff + 1] = a[1] + 2 * PI;
	a[0] = a[ff] - 2 * PI;
	while (tt--)
	{
		int x, y; cin >> x >> y;
		ld leng = len(x, y);
		/*int l = lower_bound(r, r + rr + 2, leng) - r;
		int s[3];
		s[1] = r[l - 1], s[2] = r[l];*/
		ld alpha = angle(x, y);
		int l = lower_bound(a + 1, a + ff + 2, alpha) - a;
		ld p[3];
		p[1] = a[l - 1], p[2] = a[l];
		ld ans = 1e10;
		for (int i = 1; i <= 2; i++)
		{
			ld beta = p[i];
			ld shadowlen = leng * cos(beta - alpha);
			int l = lower_bound(r, r + rr + 2, shadowlen) - r;
			int s[3];
			s[1] = r[l - 1], s[2] = r[l];
			for (int j = 1; j <= 2; j++)
				ans = min(ans, len2(beta, s[j], x, y));
		}
		if (ans < 1e-7)
			ans = 0;
		cout << fixed << setprecision(15) << ans << '\n';
	}
}
/*

*/