import std.stdio;
import std.string;
import std.conv;
import std.algorithm;
import std.array;
import std.math;

void main(){
  auto n = readln.chomp.to!int;
  //cos-1 1/a
  foreach(i; 0..n){
    readln;
    double[][] bolt;
    foreach(j; 0..6){
      bolt ~= readln.chomp.split(" ").map!(to!double).array;
    }
    auto maxX = bolt.map!(e => e[0]).reduce!max;
    writefln("%.15f", acos(maxX) * 180 / PI);
  }
}