import java.io.*;
import java.util.Scanner;
    
class Main{

static final InputStream in=System.in;
static final PrintWriter out=new PrintWriter(System.out);
static final int INF=Integer.MAX_VALUE;

public static void main(String[] args){
Scanner sc=new Scanner(in);
String line="";
double x=0.0;
double y=0.0;
double rx=0.0;
double ry=0.0;
int num=sc.nextInt();
while(num-->0){
for(int i=0;i<6;i++){
x=sc.nextDouble();
y=sc.nextDouble();
if(x>=0&&y>=0&&x>rx) rx=x; ry=y;
}
out.printf("%.10f\r\n",Math.toDegrees(Math.acos(rx)));
}
out.flush();
}
}