已知:如图,在平行四边形ABCD中,E、F分别为边AB、CD的中点,BD是对角线,AG∥DB交CB的延长线于G.
(1)求证:△CDB≌△BAG.
(2)如果四边形BFDE是菱形,那么四边形AGBD是什么特殊四边形?并证明你的结论.
(1)求证:△CDB≌△BAG.
(2)如果四边形BFDE是菱形,那么四边形AGBD是什么特殊四边形?并证明你的结论.
![](https://img.xkw.com/dksih/QBM/2018/8/31/2022293996208128/2023219213172736/STEM/f0fa29baa2ab447b9aa1870f1e37e890.png?resizew=197)
更新时间:2018-09-01 21:52:56
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解答题-证明题
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【推荐1】在矩形ABCD中,E为射线BC上一点,DF⊥AE于F,连接DE.
![](https://img.xkw.com/dksih/QBM/2020/3/15/2419894146875392/2420144967434240/STEM/a84b02e46b964bb6880cd4cac8db1d42.png?resizew=400)
(1)如图1,若E在线段BC上,且CE=EF,求证:AD=AE;
(2)若AB=6,AD=10,在点E的运动过程中,连接BF.
①当△ABF是以AB为底的等腰三角形时,求BE的长;
②当BF∥DE时,若S△ADF=m,S△DCE=n,探究m﹣n的值并简要说明理由.
![](https://img.xkw.com/dksih/QBM/2020/3/15/2419894146875392/2420144967434240/STEM/a84b02e46b964bb6880cd4cac8db1d42.png?resizew=400)
(1)如图1,若E在线段BC上,且CE=EF,求证:AD=AE;
(2)若AB=6,AD=10,在点E的运动过程中,连接BF.
①当△ABF是以AB为底的等腰三角形时,求BE的长;
②当BF∥DE时,若S△ADF=m,S△DCE=n,探究m﹣n的值并简要说明理由.
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解答题-作图题
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【推荐2】如图,方格纸中每个小正方形的边长均为1,线段
的端点
、
均在小正方形的顶点上.
(1)在图中画出矩形
,使矩形对角线的长度为5,点
、
均在小正方形的顶点上;
(2)在图中找一点
,连接
、
,使
,且
的面积为矩形
面积的一半,点
在小正方形的顶点上.连接
,请直接写出
的面积.
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(1)在图中画出矩形
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(2)在图中找一点
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解答题-证明题
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名校
【推荐1】如图,
是由
在平面内绕点
旋转
而得,且
,
,连接
.
;
(2)试说明四边形
为菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2036191be2322003aaee6bb411868327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2657e02314469ad2b13d31dce41b4343.png)
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(2)试说明四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d70676406f26d339465fe3473c0c05.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,在
中,作
边的垂直平分线分别交
,
于点
和点
,过点
作
交
延长线于点
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/a16eed23-4841-45b2-8d78-cdef62f3678d.png?resizew=226)
(1)求证:四边形
是菱形;
(2)若
为等腰直角三角形,
.
①四边形
是______形;
②若
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______.
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(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
(2)若
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①四边形
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②若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
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