This article describes how widescreen televisions today have a 16 to 9 ratio. This mean that for every 16 units long, the television will be units high. This differs from the original television of 4 to 3 ratio. This ratio gives the television its name because it is almost twice as wide as it is high.
http://hometheater.about.com/cs/television/a/16x9tvfactor.htm
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