I am sure that corporations decided that the diagonal would sound like the screen was larger than if measured across, so that's what they used. It is the same philosophy as pricing an item at $10.99, instead of $11.00, or gas priced at $3.328, rather than $3.33. I cannot begin to tell you the friends who say, gas is $3.32, when the price is much closer to $3.33. In their minds, the price is lower than it actually is. Business 101.
