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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.
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.
That varies, depending on the resolution and the size of the screen. In a typical case, you might have a resolution of 1024 x 768 (where 1024 is the width) pixels on a screen that is about 10 inches wide; so you get roughly 100 points per inch.
This question can be solved using pythagorus, assuming the screen is a rectangle and 15in is the measurement of the diagonal (hypotenuse) of the screen. a2 = c2 - b2 a2 = 152 - 122 a2 = 225 - 144 = 81 a = 9in