The screen dimensions of a 55-inch widescreen television with a 16:9 aspect ratio are 47.94 inches by 26.96 inches. The exact dimensions of a television are determined by the housing that contains the screen and other components. A cathode ray tube television, for instance, has substantially greater depth than a flat-screen television.
Manufacturers determine the size of a television screen by measuring it diagonally from corner to corner. A 55-inch television with a 4:3 aspect ratio will have a display of 44 inches wide by 33 inches tall. The size of a television is augmented by its speakers and control panels. When a flat-screen television is free-standing as opposed to wall-mounted, the television’s stand additionally adds height.