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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?(实在对不起,图怎么也弄不上去,是一个半圆,直径是20FT)
A.5½ ft B.7½ ft C.8 ½ ft D.9½ ft E.10 ft
请问这道题怎么做的呢??谢谢啦!
A.5½ ft B.7½ ft C.8 ½ ft D.9½ ft E.10 ft
请问这道题怎么做的呢??谢谢啦! |
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