src/ch2/Main.hs


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import           Shape

main :: IO ()
main = do
        putStrLn "Convex Polygon:"
        putStrLn
                $ show
                $ area
                          (polygon
                                  [ (550, 450)
                                  , (455, 519)
                                  , (491, 631)
                                  , (609, 631)
                                  , (645, 519)
                                  ]
                          )
        putStrLn "Concave Polygon:"
        putStrLn
                $ show
                $ area
                          (polygon
                                  [ (550, 580)
                                  , (455, 519)
                                  , (491, 631)
                                  , (609, 631)
                                  , (645, 519)
                                  ]
                          )