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tian jia fu zhu xian de fang fa
Author(s): 
Pages: 50-52
Year: Issue:  Z2
Journal: Required Reading for Junior Middle School Students

Keyword:  辅助线解决问题平行四边形三角形中线几何问题添加方法中线延长全等三角形已知条件直角三角形;
Abstract: <正>在解(证)几何问题时.如果已知条件与未知条件之间不能直接进行推理,就要考虑恰当地添加辅助线,以促使由未知向已知的转化,从而达到解决问题的目的.添加辅助线没有统一的方法,但在解题时不断总结一些带有规律性的添加方法,对于解(证)一些问题是有好处的.一、有关三角形中线问题,常将中线延长一倍,以便应用平行四边形与全等三角形的有关性质
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