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数学练习题.GWDThe figure above shows the dimensions of a semicirc

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数学练习题.GWD
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.\x055½ ft
B.\x057½ ft
C.\x058 ½ ft
D.\x059½ ft
E.\x0510 ft
上图显示了一个半圆形的截面尺寸的一种单向隧道.单一的交通是12英尺宽的距离,这是双方的隧道.如果车辆必须明确隧道顶部的至少½英尺在交通时,应该怎么弄让高度限制车辆都允许使用隧道吗?
5a½英尺
7a½英尺
8a½英尺
9a½英尺
10英尺
同学,你图没有发吧.