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 Coloring Page

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 Template

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tomski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 coloring

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

题目已知如图1四边形ABCD四条边上的中点分别为EFGH顺次连接EFFGGHHE得到四边形EFGH即四边形ABCD的 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

如图四边形EFGH的面积是66平方米．EA=ABCB=BFDC=CGHD=DA．求四边形ABCD的面积．题目和参考答案——青夏教育 sketch template

如图1矩形MNPQ中点EFGH分别在NPPQQMMN上若∠1＝∠2＝∠3＝∠4则称四边形EFGH为矩形MNPQ的反射四边形 sketch template

�国汉代数学家赵爽在注解《�髀算经》时给出的“赵爽弦图”如图所示，它是由四个全等的直角三角形与中间的小正方形拼成的一个大正方形．若大正方形的 sketch template

�们把依次连接任意一个四边形各边中点所得的四边形叫做中点四边形 如图 EFGH分别是四边形ABCD各边的中点1 求证四边形 sketch template

功欲善其事，必先利其器 ——动点到定点距离最值问题的解题思路探析参考� sketch template

人教版小学数学四年级上学期《平行四边形和梯形》单元测试题（含答案） 21世纪教育� 二一教育 sketch template

四边形经典练习题 Word文档免费下载亿佰文档� sketch template

1．作出四边形ABCD关于点O成中心对称的图形——青夏教育精英家教�—— 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1四边形ABCD中AC⊥BD于点O点EFGH分别为边ABBCCDAD的中点连接EFFGGHEHBD分别与EF sketch template

题目�们定义对角线互相垂直的四边形叫做垂美四边形．1如图1垂美四边形ABCD的对角线ACBD交于O．求证AB2 CD2＝AD2 sketch template

如图EFGH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

题目如图1已知点G在正方形ABCD的对角线AC上GE⊥BCGF⊥CD．1�求证四边形CEGF是正方形�推断的值为 sketch template

2024年浙教版数学八年级下学期第五章特殊平行四边形 单元测试（培优卷）在线组卷 sketch template

如图四边形ABCD是正方形E是边AB上一点连接DE直线DE绕着点D逆时针旋转90°交BC的延长线于点F．1如图1求证DE 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将矩形纸ABCD的四个角�内折起恰好拼成一个无缝隙无重叠的四边形EFGH若EH＝3厘米EF＝4厘米则边AD的长是 厘米——青夏 sketch template

如图1边长为a的正方形�生形变后成为边长为a的菱形如果这个菱形的一组对边之间的距离为h�们把a与h的比值叫做这个菱形的“形变度．1 sketch template

如图所示在四边形ABCD中EFGH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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EFGHCD∥平面EFGH 2若 sketch template

如图四边形ABCD中对角线相交于点OEFGH分别是ABBDBCAC的中点．求证四边形EFGH是平行四边形．题目和参考答案 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

27．操作示例对于边长为a的两个正方形ABCD和EFGH按图1所示的方式�放在沿虚线BDEG剪开后可以按图中所示的移动方式拼接为图1 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1已知四边形ABCD是正方形对角线ACBD相交于点E以点E为顶点作正方形EFGH．1如图1点AD分别在EH和EF上连接 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EFGHCD∥平面EFGH 2若 sketch template

题目如图1在正方形ABCD中点E是AB边上的一个动点点E与点AB不重合连接CE过点B作BF⊥CE于点G交AD于点F．1 sketch template

如图四边形ABCD内接于⊙OAB是⊙O的直径AC和BD相交于点E且1求证BC=CD2分别延长ABDC交于点P过点A作 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

题目如图矩形EFGH的顶点EG分别在菱形ABCD的边AD BC上顶点FH在菱形ABCD的对角线BD上若AB=6∠A=120 sketch template

如右图，四边形ABCD面积为1，且AB=AE，BC=BF，DC=CG，AD=DH．求四边形EFG 14459 趣�几何数学天地 33IQ sketch template

如图长方形ABCD是由15个大小相等的正方形拼成的每个正方形面积为1 EFGH分别在ADABBCCD边上且是某个小正方形的 sketch template

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