19．如图ef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ef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ef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

如图所示平行四边形纸条ABCD中EF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

19．如图EF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

如图四边形ABCD中对角线相交于点OEF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

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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EF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在平行四边形ABCD中EF过对角线的交点O，分别交ADBC与点EF，已知AB=4，BC=7，OE=3 百度知道 sketch template

如图ABCD中EF∥BC GH∥AB GH线交于点O图中共有平行四边形 的个数 A6 B7 C8 D9——青夏教育 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将平行四边形纸片ABCD按如图方式折叠使点C与点A重合点D的落点记为点D′折痕为EF连接CF． 1求证四边形AFCE是菱形 sketch template

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折叠得到 sketch template

如图四边形ABCD是平行四边形对角线ACBD交于点O过点O画直线EF分别交ADBC于点EF求证OE＝OF——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

13．如图四边形ABCD中对角线BDADBDBCAD=BC=则当= 时四边形ABCD是平行四边形．——青夏教育精英家教�—— sketch template

如图，已知直线MN平行于平行四边形ABCD的对角线BD，延长AB、DC、BC、AD交MN于E、F、G、H求证：EF=GH 百度教育 sketch template

如图，四边形ABCD是平行四边形，对角线AC、BD相交于点O，点E、F分别在AB、AD上，AE=AF，连接EF，且AC⊥EF．（1）求证：四边 sketch template

如图所示四边形EFGH为空间四边形ABCD的一个截面若截面为平行四边形 1求证AB∥平面EFGHCD∥平面EFGH 2若 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EF．求证四边形AECF是平行四边形．题目和 sketch template

如图1四边形ABCD中AC⊥BD于点O点EFGH分别为边ABBCCDAD的中点连接EFFGGHEHBD分别与EF sketch template

如图，在正方形ABCD中，E、F、G、H分别为AB、CD、BC、AD上的点，EF与GH相交于点P，且EF⊥ GH，连接EG、GF、FH、HE sketch template

如图过平行四边形ABCD的对角线的交点O作直线EF交ADBC分别于EF又HG分别为OBOD的中点试问四边形EHFG为平行四边形 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

如图�们把依次连接任意四边形ABCD各边中点所得四边形EFGH叫中点四边形．1若四边形ABCD是菱形则它的中点四边形EFGH一定是 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=2ADEFG分别是OCODAB的中点求证1BE⊥ sketch template

如图所示在平行四边形ABCD中EF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

百度教育 sketch template

如图所示四边形EFGH为空间四边形ABCD的一个截面若截面为平行四边形 1求证AB∥平面EFGHCD∥平面EFGH 2若 sketch template

百度教育 sketch template

如图四边形ABCD是菱形点MN分别在ABAD上且BM=DNMG∥ADNF∥AB点FG分别在BCCD上MG与NF相交于点E sketch template

如图点O是平行四边形ABCD的对角线的交点 AOB绕O旋转180º可以与重合这说明 AOB≌ 这两个三角形的对应边是AO与 ——青 sketch template

顺次连接四边形ABCD各边中点得到四边形EFGH要使四边形EFGH是菱形应添加的条件是AAD∥BCBAC=BDCAC⊥BDDAD sketch template

12．如图在平行四边形ABCD中AB=8 AD=6 E是AB边上一动点记AE=xDE的延长线CB的延长线于F设CF=y求y与x sketch template

百度教育 sketch template

如图在平行四边形DEBF中对角线EFBD 相较于点O若AC是直线EF上的两个动点分别从点EF出�以1cm/s的相同速度�远离点O sketch template

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