Concerning E-Book Readers: The use of a single diagonal measurement to describe the size of the E-Reader's screen. It was fine in the days of NTSC television since the relationship between the width and height of the screen was always the same regardless of the screen's size. The same thing when it came to HDTV.
However, when it comes to E-Reader Screens that is not the case. I have a NookColor and a Nook Glowbright 4 and with both the width of the screen is 3.5 inches, however the height of the NookColor's screen is 5.75 inches while the height of the Glowbright's screen is 4.75 inches. Due to this, they need to mention the width and height of the screen rather than just the diagonal measurement.
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