A ladder of a fire truck is elevated to an angle of 60° and extended to a length of 70 feet. If the base of the ladder is 7 feet above the ground, how many feet above the ground does the ladder reach?
这道题目该怎样画图呢？搞不清楚求得是直角三角形的哪条边呢，看不懂题目 求大牛帮忙解答 谢谢谢谢大家了~~~
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发表于 2013-10-5 10:29:08
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