import java.io.*;
import java.util.StringTokenizer;
    
class Main{
        
static final PrintWriter out=new PrintWriter(System.out);
static final int INF=Integer.MAX_VALUE;

public static void main(String[] args) throws IOException{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st;
String line="";
double x=0,y;
int num=Integer.parseInt(br.readLine());
while(num-->0){
while((line=br.readLine())!=null&&!line.isEmpty()){
st=new StringTokenizer(line);
x=Double.parseDouble(st.nextToken());
y=Double.parseDouble(st.nextToken());
if(x>1/2&&y>=0) break;
for(int i=1;i<6;i++){
st=new StringTokenizer(br.readLine());
x=Double.parseDouble(st.nextToken());
y=Double.parseDouble(st.nextToken());
if(x>1/2&&y>=0) break;
}
}
out.println(Math.toDegrees(Math.acos(x)));
}
out.flush();
}
}