#include <bits/stdc++.h>
#define PI 3.14159265
#define inf -1000000007

using namespace std;

pair <double, double> s(double a, double b, double c)
{
        double x1=0, x2=0, d=0;
        d=b*b-4*a*c;
        if(d<0)
        {
                return {inf, inf};
        }
        else
        {
                if(d==0)
                {
                        x1=-b/(2*a);
                        return {x1, inf};
                }
                else
                {

                x1=-b/(2*a)-(sqrt (d))/(2*a);
                x2=-b/(2*a)+(sqrt (d))/(2*a);
                return {x1, x2}
                }
        }

}

pair <double, double> eq(double x1, double y1, double x2, double y2)
{
	double k = (abs(y2 - y1)) / ((abs(x2 - x1)));
	double b = y1 - k * x1;

	return {k, b};
}

pair <double, double> f(double r, double k, double b)
{
	return s(k * k + 1, 2 * b * k, b * b - r * r);
}

int main()
{
	int n;
	scanf("%d", &n);

	while (n--)
	{
		double x1, y1, x2, y2, r;
		cin >> x1 >> y1 >> x2 >> y2 >> r;

		pair <double, double> a = eq(x1, y1, x2, y2);
		pair <double, double> b = f(r, a.first, a.second);

		if ((b.first == inf && b.second == inf) || (b.first != inf && b.second == inf))
			cout << sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
		else
		{
			double path;
			double angle = acos((2 * r * r - path * path) / (2 * r * r));
			angle = angle * 180 / PI;
		}
	}

	return 0;
}