GWD-2 两道数学求教~

brendawan · 发表于 2011-6-19 18:11:18

Q6:

The figure above shows the dimensions of a semicircular cross section of a one-way tunnel. The single traffic lane is 12 feet wide and is equidistant from the sides of the tunnel. If vehicles must clear the top of the tunnel by at least ½ foot when they are inside the traffic lane, what should be the limit on the height of vehicles that are allowed to use the tunnel?

A.   5½ ft
B.   7½ ft
C.   8 ½ ft
D.   9½ ft
E.   10 ft
Answer:
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这道题目没有看懂‘The single traffic lane is 12 feet wide and is equidistant from the sides of the tunnel.’指的是哪段啊？
Q30:
                       E

      B      C

      A       D

In the figure, each side of square ABCD has length 1, the length of line segment CE is 1, and the length of line segment BE is equal to the length of line segment DE. What is the area of the triangular region BCE?

A.   1/3
B.   (?2)/4
C.   1/2
D.   (?2)/2
E.   3/4

Answer:
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这道题目，不知道怎么判断BCE是个什么三角行啊？

GWD-2 两道数学求教~

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