import Control.Applicative ((<$>))
import Control.Monad (replicateM, replicateM_)
import Data.Complex (Complex(..), phase)
import qualified Data.Text as T
import qualified Data.Text.IO as T
import qualified Data.Text.Read as T
import Text.Printf (printf)

toDeg :: Double -> Double
toDeg = (/ pi) . (* 180)

computeAngle :: [Complex Double] -> Double
computeAngle = f . toDeg . (+ pi) . minimum . map phase
    where f x = if x > 55.0 then 0.0 else x

unsafeReadDouble :: T.Text -> Double
unsafeReadDouble t = case T.double t of
    Right x -> fst x
    Left e -> error e

main :: IO ()
main = do
    t <- readLn
    replicateM_ t $ do
        _ <- T.getLine
        ps <- fmap ((\(x : y : _) -> x :+ y) .
            fmap unsafeReadDouble . T.words) <$> replicateM 6 T.getLine
        printf "%.16f\n" (computeAngle ps)