如图所示的四边形abcd是边长为2的正方形，对角线ac ， Bd相交于点o 将 Bda沿bd折起到 Bda的位置，使平面abd⊥平面bcd Sketch Coloring Page

如图所示的四边形abcd是边长为2的正方形，对角线ac ， Bd相交于点o 将 Bda沿bd折起到 Bda的位置，使平面abd⊥平面bcd Template

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tomski如图所示的四边形abcd是边长为2的正方形，对角线ac ， bd相交于点o 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

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ABCD是长方形长为10厘米宽为6厘米求阴影部分的�长．题目和参考答案——青夏教育精英家教�—— sketch template

题目1如图1在四边形ABCD中AB=AD∠BAD=120°∠B=∠ADC=90°．EF分别是BCCD上的点．且∠EAF 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在直角坐标系中四边形ABCD是正方形 AC 曲线AAAA 叫做“正方形的渐开线其中AA AAAA 的圆心依次是点BC sketch template

如图所示四边形ABCD和四边形DEFG都是正方形连接AECG．1观察图形猜想AE与CG之间有怎样的关系并说明理由．2若将正 sketch template

如上右图四边形ABCD是正方形CE＝MN∠MCE＝35°那么∠ANM 等于 ——青夏教育精英家教�—— sketch template

在一个四边形中如果有两个内角是直角那么另外两个内角A都是钝角B都是锐角C一个是锐角一个是直角D互为补角——青夏教育精英家教�—— 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在四边形ABCD中对角线ACBD相交于点O∠ADB=∠CBDAD=BC．1求证四边形ABCD是平行四边形2若AC sketch template

如图所示在四边形ABCD中AB∥CD且AB=CD对角线AC和BD相交于O若不增加任何字母与辅助线要使四边形ABCD为矩形则还需 sketch template

如图所示平行四边形ABCD的面积是54平方厘米．点E是AC边的中点点MN把BC边平均分成了3份．阴影部分的面积是4545平方厘米 sketch template

如图在平行四边形ABCD中点EF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

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�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，在菱形ABCD中，AB=AC=10，对角线AC、BD相交于点O，点M在线段AC上，且AM=3，点P为线段BD上的一个动点，则MP sketch template

如图所示在任意凸四边形 ABCD 中取各边的中点并与它相对的一个顶点连结那么所围成的中央四边形面积与�围那四个阴影三角形的面积总和相等吗 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

如图所示已知图中四边形ABCD的�长是60厘米点M到各边的距离都是65厘米则这个四边形的面积是平方厘米．题目和参考答案——青夏教育 sketch template

如图四边形ABCD为菱形 1 用直尺和圆规作出过菱形的顶点 ABC的圆记为⊙O 要求保留作图痕迹不必写出作法 2连接 sketch template

如图，在矩形ABCD中，AB=16，BC=18，点E在边AB上，点F是边BC上不与点B、C重合的一个动点，把 EBF沿EF折叠，点B落在点B sketch template

在四边形ABCD内找一点O，使它到四边形四个顶点的距离之和最小，并请说出你的理由。百度知道 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

两条对角线 的四边形是正方形——青夏教育精英家教�—— sketch template

已知如图所示在�格中建立平面直角坐标系每个小正方形的边长都是1个单位长度四边形ABCD的各顶点均在格点上．1将四边形ABCD绕坐标 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21表示方格纸上A点的位置用12表示B点的位置那么四边形 sketch template

如图四边形ABCD的对角线ACBD相交于O且将这个四边形分成��四个三角形．若OAOC=0BOD则下列结论中一定正确的是 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

定义：有一组对角互补的凸四边形叫做“对补四边形”【概念理解�1在以下三种图形中：�平行四边形，�正方形，�长方形，一定是“对补四边形”的 sketch template

如图四边形ABCD和A′B′C′D′是以点O为位似中心的位似图形若OAOA′=23则四边形ABCD与四边形A′B′C′D′的面积比为 sketch template

如图所示，正方形ABCD由四个相同的长方形和一个小正方形拼成，则能确定小正方形的面积（）（1）已知 MBA考试题库帮考� sketch template

在如图所示的几何体中四边形是正方形平面分别为的中点且 I求证平面平面 II求三棱锥与四棱锥的体积之比 �题 sketch template

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