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.
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acctual width of a 46'' tv
You measure the screen by going diagonal across the screen. Some screens are up to one inch smaller than their advertised size.
Best selling 55" tv's
Surface area is length times width (or width times length). In this case, 29 times 32 = 928 square inches.
A polygon must be a 2-dimensional object so it cannot have any thickness (such as a sheet of paper), not can it have any curvature. So a picture on your TV screen - but only if it is a flat screen - is likely to be one of the few true examples.