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qiao qu zhong dian miao zheng ti
Author(s): 
Pages: 38-40
Year: Issue:  Z2
Journal: Required Reading for Junior Middle School Students

Keyword:  中点直角三角形三角形中位线已知条件平行四边形解题思路常见题型斜边中线性质;
Abstract: <正>在三角形和四边形的已知条件中,含有中点的问题是一种常见题型.对于这类问题.联想到三角形(或梯形)的中位线或直角三角形斜边上的中线的性质,若设法找到另一个与待证结论关联的中点作连线,往往可使解题思路豁然开朗.例1如图1,在四边形ABCD中,AD=BC,M、N分别是BD、AC的中点,直线MN分别交BC、AD于F、E.求证:∠AEF=∠BFE.分析注意到已知条件中有两个中点M和N,联想到三角形中
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