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2019年春八年级数学下册第19章四边形小专题（五）特殊平行四边形的计算与证明课件（新版）沪科版.pptx

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小专题(五) 特殊平行四边形的计算与证明,特殊平行四边形具有平行四边形的所有性质,而且在边、角、对角线方面有其独有的性质,能得到相等的角和相等的线段,为几何图形的计算和证明提供了重要的依据,是近几年全国各省市中考的必考内容.,证明:四边形ABCD是平行四边形, OA=OC,OB=OD, AE=CF,OE=OF, 四边形EBFD是平行四边形. EF=BD,平行四边形EBFD是矩形.,

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