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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

题目探究如图� 在四边形ABCD中∠BAD=∠BCD=90°AB=ADAE⊥CD于点E．若AE=10求四边形ABCD的面积 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

如图EFGH分别是四边形ABCD的边ABBCCDDA的中点顺次连接EFGH所得的四边形EFGH显然是平行四边形．1当 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

如图所示正方形ABCD的边长为10厘米EF分别为AB 及BC的中点．四边形BFGE的面积是 平方厘米．题目和参考答案——青夏教育精英家教�—— sketch template

如图所示，四边形ABCD是圆O的内接四边形，AB的延长线与DC的延长线交于点E，且∠D=∠E．1求证：∠ADC=∠CBE； 2求证 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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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

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

如图所示，四边形ABCD是圆O的内接四边形，AB的延长线与DC的延长线交于点E，且∠D=∠E．1求证：∠ADC=∠CBE； 2求证 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

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

在如图所示的几何体中四边形ABCD为矩形平面ABEF⊥平面ABCDEF∥AB∠BAF=90°AD=2AB=AF=2EF=1点P在 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

如图所示已知空间四边形的每条边和对角线长都等于a点EFG分别为ABADDC的中点则a2等于 A．2BABCB．2AD sketch template

如图所示 在凸四边形ABCD中已知 ∠BAC = 25° ∠BCA 20° ∠BDC 50° ∠BDA 40° 若 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

如图正方体ABCD A1B1C1D1的棱长为1P为BC的中点Q为线段CC1上的动点过点APQ的平面截该正方体所得的截面记为S则 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

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

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

如图所示，凸四边形ABCD中，对角线AC、BD相交于0点．若三角形AOD的面积是2，三角形COD的面积是1，三角形COB的面积是4，则四边形 sketch template

24．如图甲四边形是等腰梯形由个这样的等腰梯形可以拼出图乙所示的平行四边形 1求四边形四个内角的度数 2试探究四边形四条边 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

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

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

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

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