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) ] )