import Control.Applicative
import Control.Monad

main :: IO ()
main = do
  n <- readLn
  solve <$> replicateM n (getLine >> replicateM 6 f) >>= mapM_ print
  where
    f = map read <$> words <$> getLine

solve :: [[[Double]]] -> [Double]
solve = map f
  where
    f = minimum . filter (>= 0.0) . map ang . filter (\[x, y] -> x < xmx && x > xmn && y > 0)
    xmn = cos (pi * 171 / 180.0)
    xmx = cos (pi * 119 / 180.0)

ang :: [Double] -> Double
ang [x, _]
  | abs a < 0.0000001 = 0.0
  | otherwise = a
  where
    a = 180.0 * acos x / pi - 120.0