When tube TVs started to become more rectangular in shape, the diagonal measurement of the screen became the largest observable length on the device, rather than the complete diameter. This is why diagonal measurements became the standard — if you want to adequately illustrate how big something is to a customer, you give them the biggest number you’ve got.
TVs are measured from the top-left to the bottom-right in inches. Interestingly, even in countries that use the metric system, TVs are all measured in inches rather than centimeters. There’s a good reason for this — inches are more flexible than centimeters when it comes to providing static statistics. Let’s say, for instance, you’ve got a TV with a 48.5-inch display, plus a half-inch bezel. Round that up to a clean 49 inches, and the TV appears bigger than it actually is. It’s a nifty marketing tactic, though it’s also helpful for keeping TVs organized in uniform classes. If every single TV was differentiated down to its minute centimeter differences, there wouldn’t be enough room in a Best Buy to give them their own dedicated shelves.
Super high-definition curved screen TVs are still measured diagonally for the purpose of classification, though in the event the curved design becomes a universal norm, admittedly unlikely as that is, we could see another measurement system overhaul in our lifetime. Who knows, we could see a return of diameter measurements someday.
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