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GWD2
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: b
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能翻译下吗.

TOP

是不是等于7? ft呀?
10^2-6^2-1/2

TOP

图就是个半圆,直径是20ft

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