2. 外语
  3. The size of a flat-screen television is given as the length of the screen’s diagonal. How many square inches greater is the scre

The size of a flat-screen television is given as the length of the screen’s diagonal. How many square inches greater is the scre

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问题 The size of a flat-screen television is given as the length of the screen’s diagonal. How many square inches greater is the screen of a square 34-inch flat-screen television than a square 27-inch fiat-screen television?
选项 A、106.75
B、213.5
C、427
D、729
E、1,156
答案B
解析 The question specifies that the televisions are square, so the diagonals are part of 45-45-90 triangles. This means that the side of such a television is the diagonal divided by . This would be an awkward number to deal with, but the question calls for areas, so you need to square the length of a side in order to get the area of the screen, thereby removing the square root. Set up the equation
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