That means, if I did not have a camber line, or if this camber line was straight, then I would
have had equal area on both sides that is, I would have got an aerofoil section which would
have looked like this- do you get it?- this is still aerofoil section, blunt face, blunt leading
edge, trailing edge this, this is my nose tail line and also the mean line, so there is no camber
here, what does it mean? This side area is same as this side area.