如图,在△ABC中,AB=AC,点D、E分别是线段BC、AD的中点,过点A作AF
BC,交BE的延长线于点F,连接CF.试判断四边形ADCF的形状,并给予证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/c31d0ff4-bcd4-49dd-aad3-2a104a8e98e8.png?resizew=116)
更新时间:2022-07-01 08:21:28
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【推荐1】某同学用11块高度都是2cm的相同长方体小木块,垒了两堵与地面垂直的木墙,木墙之间刚好可以放进一个正方体ABCD(∠ABC=90°,AB=BC),其截面示意图如图所示,点B在EF上,点A和点C分别与木墙的顶端重合,求两堵木墙之间的距离EF.
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【推荐2】在直角三角形
中,
,
是
边上的高,
.
的面积;
(2)求
的长;
(3)若
是
的角平分线,
交
于点
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的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
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(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】(1)如图,直线
经过
上一点C,连接
,从以下三个信息中选择两个作为条件,剩余的一个作为结论组成一个真命题,并写出你的证明过程.①
;②
;③
是
的切线.你选择的条件是____________,结论是______(填序号);
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/50a921c8-e8d9-4cdd-889f-c81ba9c3de59.png?resizew=154)
(2)在(1)的条件下,若
,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/50a921c8-e8d9-4cdd-889f-c81ba9c3de59.png?resizew=154)
(2)在(1)的条件下,若
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【推荐2】下面是某数学兴趣小组探究用不同方法作线段
的垂直平分线的讨论片段,请仔细阅读,并完成相应的任务:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
小明:如图1,①分别以点A,B为圆心,大于![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() 小军:我认为小明的作图方法很有创意,但是太麻烦了,我的第③步改进如下:如图2,连接 ![]() ![]() |
(1)小明的作图依据是______.
(2)判断小军作图得到的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
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【推荐1】如图,在四边形
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【推荐2】如图,平行四边形
的对角线
交于点O,E为
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为平行四边形.
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【推荐1】平行四边形
中,过点
作
于点
,点
在
上,
,连接
.求证:四边形
是矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】如图,
是
的边
的中点,连接
,且
,求证:四边形
是矩形.
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