Monitor size is measured from one corner of the screen to another, one corner diagonally opposite
. But one of the problems with this kind of measurement is not able to distinguish whether the monitors will have much effect, although the ratio will be much the same diagonal, due to the fact that the rectangular. For example, 21-inch monitor in the ratio 4:There are 3 areas of approximately 211 square inches, while the monitor 21 inches widescreen ratio 16: 9 display with just 188 square inches only