What aspect ratio does high definition come in?

A high definition signal is transmitted in a 16:9 aspect ratio. 16:9 is also known as wide screen or letter box - like the screen in movie theatres. You can buy high definition televisions with either a standard (4:3) or widescreen aspect ratio. Really, it's a matter of preference, whether you like the square or rectangular screen. Most programming can be formatted to fit whatever aspect ratio you prefer.
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