That makes no sense

Of course CRT monitors viewable is measured diagonally. That's common knowledge and had nothing to do with the observation or question posed.

What I'm saying and asking is LCD dimensions do not correspond to the size of the LCD advertised nor do they specify a "viewable" like CRT monitors are required too. Do LCD monitors fall into the same catagory as CRT Monitors when advertising their size as mesured diagonally (viewable)?