云南省2018年中考数学总复习第四章三角形第四节全等三角形课件.ppt

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第四节 全等三角形,考点 全等三角形的判定及性质 命题角度 平移型 例1(2017云南省卷)如图,点E、C在线段BF上,BECF,ABDE,ACDF.求证:ABCDEF.,【分析】 先证明ABCDEF,然后利用全等三角形的性质即可得证,【自主解答】证明:BECF, BEECCFEC,BCEF, 在ABC和DEF中,ABCDEF(SSS), ABCDEF.,命题角度 对称型 例2(2015云南省卷)如图,BD,请添加 一个条件(不得添加辅助线),使得ABCADC, 并说明理由 【分析】已知这两个三角形的一个边与一个角 相等,所以再添加一个对应角相等即可,【自主解答】 解:添加BACDAC.理由如下: 在ABC和ADC中,ABCADC(AAS),命题角度 旋转型 例3(2018云南省卷)如图,已知AC平分 BAD,ABAD. 求证:ABCADC. 【分析】根据角平分线的性质得到一组等角,已知一组等 边,再找一组等边或等角证明,【自主解答】 证明:AC平分BAD, BACDAC, 在ABC和ADC中,ABCADC(SAS),例4 如图,ACAE,12,ABAD.求证:BCDE. 【自主解答】证明:12, CAB1EAB2EABEAD, 在CAB和EAD中,CABEAD(SAS), BCDE.,

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