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The size of a television screen is given as the length of

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Intern
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The size of a television screen is given as the length of [#permalink] New post 28 Nov 2003, 06:35
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The size of a television screen is given as the length of the screenтАЩs diagonal. If the screens were flat, then the area of a square 21-inch screen would be how many square inches greater than the area of a square 19-inch screen?

Can u post an explaination.
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 [#permalink] New post 28 Nov 2003, 07:17
These are square tellies. Just use the pythagorean theorm = a^2 + a^2 = c^2 (assuming a=b). simplifies to 2a^2=c^2 or a^2=c^2/2

thus setup your equation

19^2/2 = 180.5

21^2/2 = 220.5

difference is: 40

Hope this helps.
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 [#permalink] New post 28 Nov 2003, 07:26
Thanks - I read the problem again after ur explaination - I overlooked the square screen - and that is where I got lost.
  [#permalink] 28 Nov 2003, 07:26
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The size of a television screen is given as the length of

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