Bunuel wrote:
The size of a television screen is given as the length of the screen's 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?
(A) 2
(B) 4
(C) 16
(D) 38
(E) 40
If the size of a square television screen is given by its diagonal, we need side lengths to calculate area.
The relationship between the a square's side and its diagonal, d, is given by
\( s\sqrt{2} = d \)
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