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1、.............o............o............o.............o.............外.............o............o.............o.............装.............o.............o............o.............订.............o.............o.............o.............线.............o.............o......
2、....................o.............o............o.........学校：___________姓名：____________班级：____________考号：____________.............o.............o..........................o.............内.............o.............o.............o...........装.............o.............o.
3、............o............订.............o.............o.............o............线.............o.............o.............o.............o.............o.............o........菱形证明专题训练1.已知:如图,在四边形ABCD中,AB∥CD,E,F为对角线AC上两点,且AE=CF,DF∥BE,AC平分∠BAD.求证:四边形ABCD为菱形. 2.如图，矩形ABCD中，
4、点O为AC的中点，过点O的直线分别与AB，CD交于点E，F，连接BF交AC于点M，连接DE，BO.若∠COB=60°，FO=FC. 求证:(1)四边形EBFD是菱形;(2)MB∶OE=3∶2.3.如图,在△ABC中,∠ABC=90°,BD为AC边上的中线,过点C作CE⊥BD于点E,过点A作BD的平行线,交CE的延长线于点F,在AF的延长线上截取FG=BD,连接BG,DF.求证:四边形第5页共6页.............o............o............o.............o.............外
5、.............o............o.............o.............装.............o.............o............o.............订.............o.............o.............o.............线.............o.............o..........................o.............o............o.........学校：________
6、___姓名：____________班级：____________考号：____________.............o.............o..........................o.............内.............o.............o.............o...........装.............o.............o.............o............订.............o.............o.............o
7、............线.............o.............o.............o.............o.............o.............o........BGFD是菱形. 4.如图,点O是菱形ABCD对角线的交点,DE∥AC,CE∥BD,连接OE. 求证:OE=BC. 6.(7分)如图,CE是△ABC外角∠ACD的平分线,AF∥CD交CE于点F,FG∥AC交CD于点G,求证:四边形ACGF是菱形. 8.如图，菱形ABCD的对角线AC与BD相交于O，点E，F分别为边AB，AD的
8、中点，连接EF，OE，OF，求证：四边形AEOF是菱形. 第5页共6页.............o............o............o.............o.............外.............o......
