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作者: 青衿 时间: 2011-1-26 07:03
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。作者: yiweiayumi 时间: 2011-1-26 07:08
先问问楼主答案是哪个作者: sdcar2010 时间: 2011-1-26 08:20
6^2 + (x+0.5)^2 = 10^2
