Hi, Hope someone can help me, just starting out with SOE.My code : module Main where import Graphics.SOE.Gtk spaceClose :: WIndow -> IO() spaceClose w = do k <- getKey w if k == ' ' then closeWindow w else spaceClose w equilateralTri :: Window -> Int -> Int -> Int -> IO() equilateralTri w x y side = drawInWindow w (withColor Red (polygon [(x,y),(a,b),(x,y)])) where b = y + side * sin(pi/3) a = x + side * cos(pi/3) main = runGraphics( do w <- openWindow "Equilateral Triangle" (400,400) equilateralTri w 50 300 200 spaceClose w ) all of the above in file triangle.hs when I do a :l triangle.h in ghci, I get the following error triangle.hs:17:36: No instance for (Floating Int) arising from use of 'pi' at triangle.hs:17:36-37 Probable fix: add an instance declaration for (Floating Int) In the first argument of '(/)', namely 'pi' In the first argument of 'cos', namely '(pi / 3)' In the second argument of '(*)', namely 'cos (pi/3)' Failed, modules loaded: none Can someone help me what's going on to a brand new newbie. All I can figure out is that some type mismatch between float and int . I tried various combinations of lets and wheres and I still get the same complaints. I am just linearly studying SOE Thanks, - br