19．如图ef分别是平行四边形abcd对角线bd所在直线上两点de＝bf．请你以f为一个端点和图中已标有字母的某一点连成一条新的线段 Sketch Coloring Page

19．如图ef分别是平行四边形abcd对角线bd所在直线上两点de＝bf．请你以f为一个端点和图中已标有字母的某一点连成一条新的线段 Template

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tomski19．如图ef分别是平行四边形abcd对角线bd所在直线上两点de＝bf．请你以f为一个端点和图中已标有字母的某一点连成一条新的线段 coloring

平行四边形的定义和性质 Word文档在线阅读与下载免费文档 sketch template

19．如图EF分别是平行四边形ABCD对角线BD所在直线上两点DE＝BF．请你以F为一个端点和图中已标有字母的某一点连成一条新的线段 sketch template

平行四边形专题训练 Word文档在线阅读与下载无忧文档 sketch template

人教版初中数学八年级下册平行四边形的对角线互相平分公开课优质课课件教案视� 知乎 sketch template

如图所示平行四边形纸条ABCD中EF分别是边ADBC的中点张老师请同学们将纸条的下半部分平行四边形ABFE沿EF翻折得到一个V字形 sketch template

题目如图四边形ABCD是平行四边形EF是对角线BD上的点∠1=∠2． 1求证BE=DF2求证AF∥CE．题目和参考 sketch template

如图在平行四边形ABCD中点EF分别在ADBC上且AE=CF 求证BE=DF 题目和参考答案——青夏教育精英家教�—— sketch template

已知如图在平行四边形ABCD中EF分别是边BCCD上的点且EF∥BDAEAF分别交BD于点G和点HBD=12EF=8求 sketch template

如图在平行四边形ABCD中O是AC与BC的交点过O点的直线EF与ABCD的延长线分别交于E，F 百度知道 sketch template

如图所示在平行四边形ABCD中EF分别是ABCD上的点且AE=CF连接BFDE试猜测∠ADE与∠CBF的大小关系并加以证明 sketch template

如图平行四边形ABCD的对角线ACBD相交于点O点EF分别是线段AOBO的中点若AC BD=30cm OAB的�长为23cm则 sketch template

题目如图在平行四边形ABCD中AB=6BC=4∠B=60°点E是边AB上的一点点F是边CD上一点将平行四边形ABCD沿EF sketch template

如图四边形ABCD中对角线相交于点OEFGH分别是ABBDBCAC的中点．求证四边形EFGH是平行四边形．题目和参考答案 sketch template

【问题情境�（1）如图1，正方形ABCD中，E、F分别是边AB和对角线AC上的点，∠EDF=45°．易证 DBE∽ DCF（不需写出证明过程 sketch template

如图，已知四边形ABCD菱形，点E、F、G、H分别在菱形的四条边上，且AE=CG，AH=CF．（1）求证：四边形EFGH是平行四边形；（2）若 sketch template

如图EFGH分别是四边形ABCD的边ABBCCDDA的中点顺次连接EFGH所得的四边形EFGH显然是平行四边形．1当 sketch template

小明遇到一个问题如图1正方形ABCD中EFGH分别是ABBCCD和DA边上靠�ABCD的n等分点连接AFBGCH sketch template

如图，矩形ABCD中，BC=8，点E，F分别是AB，AD的中点连结CE，EF，CE交对角线BD于点G当点Q从点D匀速运动到点G时，点P恰好 sketch template

如图四边形ABCD中对角线ACBD相交于点O点EF分别在线段OAOC上且OB=OD∠1=∠2AE=CF．1证明 BEO sketch template

7．如图5点DEF分别是ABBCCA边的中点则图中的平行四边形一共有 3个 D4个——青夏教育精英家教�—— sketch template

如图EFGH分别是四边形ABCD四条边的中点则四边形EFGH一定是 A．平行四边形B．矩形C．菱形D．正方形题目和参考答案 sketch template

如图平行四边形ABCD的对角线相交于点O直线EF经过点O分别与ABCD的延长线交于点EF．求证四边形AECF是平行四边形．题目和 sketch template

15． 如图已知平行四边形ABCD和矩形ACEF所在的平面互相垂直 1求证AC⊥BF 2求二面角F BD A的大小 3 sketch template

如图在平行四边形ABCD中E为BC边上的一点连接AEBD交于点FAE=AB．1若∠AEB=2∠ADB求证四边形ABCD是菱形 sketch template

如图所示在四边形ABCD中EFGH分别是四边形ABCD各边的中点已知阴影部分的面积是10求四边形SRPQ的面积．题目和参考答案 sketch template

如图所示在平行四边形ABCD中EF分别是ABCD上的点且AE=CF连接BFDE试猜测∠ADE与∠CBF的大小关系并加以证明 sketch template

如图在平行四边形ABCD中对角线ACBD的长度分别为10和6则AB长度的最大整数值是 A．8B．5C．6D．7——青夏教育精英家教�—— sketch template

已知如图 ABCD各角的平分线分别相交于点EFG H 求证 四边形EFGH是矩形．——青夏教育精英家教�—— sketch template

7．如图5点DEF分别是ABBCCA边的中点则图中的平行四边形一共有 3个 D4个——青夏教育精英家教�—— sketch template

如图，在四边形ABCD中，对角线AC与BD交于点O，已知OA =OC，OB=OD，过点O作EF⊥ BD，分别交AB、DC于点E，F，连接DE sketch template

如图 EFGH分别是空间四边形ABCD的边ABBCCDDA的中点求证 1四边行EFGH是平行四边形 2若AC sketch template

如图EFMN分别是边长为4的正方形ABCD四条边上的点且AE=BF=CM=DN．那么四边形EFMN的面积的最小值是8．题目和参考 sketch template

12分如图在平行四边形ABCD中对角线ACBD相交于点OBD=2ADEFG分别是OCODAB的中点求证1BE⊥ sketch template

如图在平行四边形ABCD中AE⊥BC于EAE=EB=EC=a且a是一元二次方程x2 2x 3=0的根则平行四边形ABCD的�长为A sketch template

矩形ABCD中，AB= 3 ，BC= 4．点E，F在对角线AC上，点M，N分别在边AD，BC上．1如图1，若AE=CF=1，M，N分别是 sketch template

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