如图四边形abcd是平行四边形．o是对角线ac的中点过点o的直线ef分别交abdc于点ef与cbad的延长线分别交于点gh Sketch Coloring Page

如图四边形abcd是平行四边形．o是对角线ac的中点过点o的直线ef分别交abdc于点ef与cbad的延长线分别交于点gh Template

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tomski如图四边形abcd是平行四边形．o是对角线ac的中点过点o的直线ef分别交abdc于点ef与cbad的延长线分别交于点gh coloring

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

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

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四边形ABCD中对角线ACBD相交于点O点EF分别在线段OAOC上且OB=OD∠1=∠2AE=CF．1证明 BEO sketch template

如图在平行四边形ABCD中AD=2ABCE平分∠BCD延长CEBA交于点F连接ACDF．1如图1求证四边形ACDF是平行 sketch template

如图已知四边形ABCD是平行四边形．1作∠A的平分线交BC于点E．用尺规作图保留作图痕迹不用写作法中若AD=6EC=2求 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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四边形ABCD中对角线相交于点OEFGH分别是ABBDBCAC的中点．求证四边形EFGH是平行四边形．题目和参考答案 sketch template

平行四边形ABCD的对角线交于点OS AOB=2cm则SABCD= ．题目和参考答案——青夏教育精英家教�—— sketch template

如图四边形ABCD是平行四边形．1请用直尺和圆规按下列步骤作图保留作图痕迹�作∠BAD的平分线交CD于E交BC的延长线于F� sketch template

如图9 ABCD中AC是对角线BM⊥AC于MDN⊥AC于N四边形BMDN是平行四边形吗为什么提升能力题1．如图1在四边形 sketch template

有趣的小学数学知乎 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

4．如图已知四边形ABCD是平行四边形点P是平面 ABCD外的一点则在四棱锥P ABCD中M是PC 的中点在DM上取一点G过G和 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平行四边形ABCD中O是AC与BC的交点过O点的直线EF与ABCD的延长线分别交于E，F 百度知道 sketch template

如图ABCD中AB⊥ACAB=1BC=5对角线BDAC交于点O．将直线AC绕点O顺时针旋转分别交BCAD于点EF．1试 sketch template

如图，在四边形ABCD中，AB=AD，∠ BAD=∠ BCD=90^° ，连接AC，若AC=8，则四边形ABCD的面积为。百度教育 sketch template

如图2四边形ABCD中AB∥CD要使四边形ABCD为平行四边形则可添加的条件为 ——青夏教育精英家教�—— sketch template

百度教育 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BFDE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中M是BC的中点且AM=9BD=12AD=10则ABCD的面积是 A．30B．36C．54D．72 题目 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

如图四边形EFGH是由四边形ABCD经过旋转得到的．如果用有序数对21表示方格纸上A点的位置用12表示B点的位置那么四边形 sketch template

如图F是平行四边形ABCD的边AD上一点CF交BA的延长线于点E若AFFD=23AB=4求AE的长．题目和参考答案——青夏教育精英 sketch template

如图四边形ABCD是平行四边形BEEC=12F是DC的中点三角形ABE的面积是12cm2那么三角形ADF的面积是1818cm2 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

已知如图四边形ABCD是平行四边形且∠1＝∠2 试说明 CEF的哪两边之和恰好等于 ABCD的�长并简述理由——青夏教育精英家教�—— sketch template

如图在平行四边形ABCD中E为BC边上的一点连接AEBD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AC平分∠BAD∠ADC ∠ABC=180°．1求证CD=CB2若BC=10AB=21AD=9 sketch template

如图所示在四边形ABCD中EF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在平行四边形ABCD中AB=5cmBC=9cm∠ABC的平分线交AD于点E交CD的延长线于F．求DF的长．题目和参考答案——青 sketch template

如图四边形ABCD内接于⊙OAB是⊙O的直径AC和BD相交于点E且1求证BC=CD2分别延长ABDC交于点P过点A作 sketch template

如图，在四棱锥P ABCD中，底面ABCD是平行四边形，∠BCD=120°，侧面PAB⊥底面ABCD，PB=2√6，AB=AC=PA=2√3 sketch template

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