求大牛指点一道数学题 GWD Math2 Q6

青衿 · 发表于 2011-1-26 07:00:52

以下这道题，GWD给的答案是B? 偶题目怎么也读不懂，请大牛指教。不胜感激！：）

Q6:

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

A. 5½ft
B. 7½ft
C. 8½ ft
D. 9½ft
E. 10ft

青衿 · 发表于 2011-1-26 07:03:05

不好意思，刚开始在CD发帖子，图没贴上来，图就是一个半圆，标着直径20ft。

yiweiayumi · 发表于 2011-1-26 07:08:32

先问问楼主答案是哪个

sdcar2010 · 发表于 2011-1-26 08:20:51

6^2 + (x+0.5)^2 = 10^2

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求大牛指点一道数学题 GWD Math2 Q6

所属分类: GMAT考试

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