问题标题:
【求翻译GRE数学题Thefigureaboveshowsthedimensionsofasemicircularcrosssectionofaone-waytunnel.Thesingletrafficlaneis12feetwideandisequidistantfromthesidesofthetunnel.Ifvehiclesmustclearthetopofthetunnelby】
问题描述:
求翻译GRE数学题
Thefigureaboveshowsthedimensionsofasemicircularcrosssectionofaone-waytunnel.Thesingletrafficlaneis12feetwideandisequidistantfromthesidesofthetunnel.Ifvehiclesmustclearthetopofthetunnelbyatleastfootwhentheyareinsidethetrafficlane,whatshouldbethelimitontheheightofvehiclesthatareallowedtousethetunnel?
A.5ft
B.7ft
C.8ft
D.9ft
E.10ft
图就是一个半圆,上面标出直径为20ft
我现在看不懂题目.不知道说什么意思.求教高人
赖卫平回答:
直径为20ft的半圆形交通隧道,行车道在隧道中央,宽12ft.要求过往车辆距隧道顶部最近处不能少于1ft,下列多高的车应该被禁止通行?
应该是限高7.2ft
选CDE
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