So if you have a widescreen 16:9 monitor that's 27 inches (diagonal), do you think it's larger than a standard 3:4 that's 27 inches diagonal? If so, you need to go back to 5th grade geometry class.
If would help if you get your comparison right. (what grade is that taught in?)
If there was a 16:9 monitor that was 28" diagonally and a 3:4 that was 27" diagonally, you can make the case that 28" is larger than 27"