import Text.Printf

main = interact $ unlines . map (printf "%.9f" . bolt) . read' . tail . lines
 where
  read' [] = []
  read' xs = map (map read . words) xys : read' xs'
   where (xys,xs') = splitAt 6 (tail xs)

bolt :: [[Double]] -> Double
bolt = head . filter (\d -> -1 < d && d < 51) . map (\[x,y] -> atan (y/x) * (180/pi))