Its diagonal just like a TV is. Or any other screen is measured for that matter --- We're Americans! We don't quit just because we're wrong. We just keep doing the wrong thing until it turns out right.
#4PsythikPosted 3/1/2014 7:40:04 PM
A monitor's listed size is almost never exact, which is why you see them listed as 23" class monitors instead of just 23". The actual diagonal size can vary by up to an inch. For example, most 22" class monitors are actually 21.6". --- 4670K | 2GB GTX 770 OC | 8GB 1600 9-9-9-24 | 120GB SSD | 1TB WD Blue | Win8.1 Pro http://i597.photobucket.com/albums/tt56/S26DG44B/PsythikViolet_Blooded.jpg