I know of a website where you can type in the diagonal, width, or heigth of a normal or widescreen television and it will give you the rest of the dimensions. This is helpful for those that want to get a good idea of how much space a tv will take up in a entertainment center or in the room before buying one.
The link is http://www.slagfarm.demon.co.uk/Widescreen.html
The link is http://www.slagfarm.demon.co.uk/Widescreen.html