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在边长为4的正方形ABCD中，AC与BD相交于O．减去△AOB，将剩下部分沿OC、OD折叠，使OA、OB重合，则以A（B），C，D，O为顶点的四面体的体积为（ ）
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高一上学期数学《》真题及答案
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▱ABCD的对角线AC与BD相交于点O.且AC⊥BD请添加一个条件使得▱ABCD为正方形.
四边形ABCD的对角线AC.BD相交于点O.AD//BCAD=BC使四边形ABCD为正方形下列条件中
①②
②③
②④
①②或①④
在边长为1的正方形ABCD中AC与BD相交于O以ABCD分别为圆心以对角线长的一半为半径画圆弧与正
0.43
0.57
0.64
0.71
如图正方形ABCD的对角线ACBD相交于点O.延长CB至点F.使CF＝CA连接AF∠ACF的平分线分
如图所示正方形ABCD的对角线相交于点O.点O.是正方形A.′B.′C.′O.′的一个顶点如果两个正
已知O.为正方形ABCD对角线上一点以O.为圆心OA的长为半径的⊙O.与BC相切于M.与ABAD分别
□ABCD的对角线AC与BD相交于点O.且AC⊥BD请添加一个条件使得□ABCD为正方形.
矩形ABCD的对角线ACBD相交于点O.请你添加一个适当的条件答案不唯一使其成为正方形.只填一个即可
如图正方形ABCD的边长为1对角线ACBD相交于点O.P.是BC延长线上一点AP交BD于E.交CD于
如图边长为2的正方形ABCD的对角线相交于点O.过点O.的直线分别交ADBC于E.F.则阴影部分的面
如图所示菱形ABCD中对角线ACBD相交于点O.若再补充一个条件能使菱形ABCD成为正方形则这个条件
如图已知正方形ABCD的边长为1连接ACBD相交于点OCE平分∠ACD交BD于点E.则DE=.
如图已知正方形ABCD的边长为4对角线AC与BD相交于点O.点E.在DC边的延长线上.若∠CAE=1
已知O.为正方形ABCD对角线上一点以O.为圆心OA的长为半径的⊙O.与BC相切于M.与ABAD分别
如图在四边形ABCD中对角线AC.BD相交于点O.若AO＝CO＝BO＝DOAC⊥BD则四边形ABCD
平行四边形
矩形
菱形
正方形
正方形ABCD的对角线ACBD相交于点O.那么该正方形中共有个等腰直角三角形.
如图已知在正方形ABCD中对角线AC与BD相交于点O.OE∥AB交BC于点E.若AD＝8cm则OE的
3 cm
4 cm
6 cm
8 cm
如图正方形ABCD中对角线ACBD相交于点O.则图中的等腰三角形有
4个
6个
8个
10个
如图已知正方形ABCD的边长为4对角线AC与BD相交于点O.点E.在DC边的延长线上.若∠CAE=1
如图正方形ABCD的对角线AC和BD相交于点O.O.又是正方形A1B1C1O的一个顶点OA1交AB于
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