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dibble1 | 18:22 Thu 20th Aug 2009 | Technology
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Why are television screens measured diagonally and not width times height?
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Because it makes the TV set appear larger than it is.

25 inch seems larger than saying 20 x 15 inch. It's all about selling the thing.
also because all TV used to be the same aspect ration (4:3) so there was no need to quote 2 dimensions for it, one single diagonal dimension told you everything you needed to know.

Now you need to know the diagonal size and the aspect ratio (4:3 or 16:9)
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Many thanks

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