You measure the screen by going diagonal across the screen. Some screens are up to one inch smaller than their advertised size.
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acctual width of a 46'' tv
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Early flat screen televisions were typically up to 4 inches deep. The latest are under one inch deep and the OLED televisions due to reach the markets in 2012 and 2013 are heading for a mere one quarter inch deep.
21 inches is the diagonal measure of the screen in a 21-inch TV.
TVs are usually sold in inches or centimeters (the diagonal measurement of the screen size).