1 #include <iostream>
 2 #include <cmath>
 3 #include <cstdio>
 4 using namespace std;
 5 const double pi=3.14159265;
 6 struct Point
 7 {
 8     double x,y;
 9     //Point(int X,int Y):x(X),y(Y){};
10 };
11 inline double function_1(double hd)
12 {
13     return 180/pi*hd;
14 }
15 inline double function_2(Point p)
16 {
17     if(p.x>=0&&p.y>=0)
18         return function_1(atan(p.y/p.x));
19     else if(p.x<0&&p.y>=0)
20         return function_1(atan(p.y/p.x))+180;
21     else if(p.x<0,p.y<=0)
22         return function_1(atan(p.y/p.x))+180;
23     else
24         return function_1(atan(p.y/p.x))+360;
25 }
26 int main()
27 {
28     int n;
29     cin>>n;
30     while(n--)
31     {
32         Point p1,p2;
33         double o=0;
34         cin>>p1.x>>p1.y>>p2.x>>p2.y;
35         //cout<<function_2(p1)<<" "<<function_2(p2)<<endl;
36         o=abs(function_2(p1)-function_2(p2));
37         //cout<<o<<endl;
38         printf("%.2lf\n",o);
39 
40     }
41     return 0;
42 }