[O.B.Left]

Im going from memory here (Yoda'll know) but I remember an account of Homer saying that the ball leaves at an angle that is about 85 percent due to face angle but that for all practical purposes you may as well say it was 90 degrees as a rule of thumb. He said something about golf not being played by people with a slide rule in their pocket or something, at least not by the people he was talking to.