如图,在
中,
为角平分线,
,
,垂足为E,点F在边
上,且
.
(1)求证
;
(2)连接
,求证
垂直平分
;
(3)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ccaba00766e9b03572655ea18bb7372.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/12e4ac8d-f3ab-483a-914f-b4fa8cdc3797.png?resizew=179)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a893fc8b2e9d55c9cdf8aceb3827a0.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4b1fdfa6c28c7b4113ba306547aa4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0fc232acd89fc499de346969ce8ced1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
更新时间:2023-12-09 21:11:18
|
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解答题-证明题
|
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(0.85)
【推荐1】如图,
,垂足分别为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/bc1ef7f7-74d3-4ce5-b87d-e4e28a05af73.png?resizew=130)
(1)求证:
;
(2)若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ecf1d78694922e9d770d5d6d40069dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/bc1ef7f7-74d3-4ce5-b87d-e4e28a05af73.png?resizew=130)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94f16737e9c6e0f00355d257d50efb7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】如图所示.
为
的边
的垂直平分线,
为
的外角的角平线,与
交于点
,垂足分别为M、N求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59c4a4eb0723665f8231dab51c1718e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-证明题
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【推荐1】如图,∠A=∠D=90°,BE平分∠ABC,且点E是AD的中点,求证:BC=AB+CD.
![](https://img.xkw.com/dksih/QBM/2022/2/10/2913312873234432/2917757899276288/STEM/5f87410e-c09b-4c71-94d4-56eadaad1efb.png?resizew=172)
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解答题-作图题
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较易
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【推荐2】已知:如图
,求作:一点
,使
在
上,且点
到
的两边的距离相等.(要求尺规作图,并保留作图痕迹,不要求写作法)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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解答题-问答题
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【推荐1】如图,已知
及射线
上一点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/e1b226c9-45b3-46a9-a902-522eeca8c12a.png?resizew=146)
(1)求作:等腰
,使线段
为等腰
的底边,点
在
内部,且点
到
两边的距离相等;
(2)在(1)的条件下,若
,则
______.(直接写出结果)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f10681704c4fccfd37664eaf34391dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/e1b226c9-45b3-46a9-a902-522eeca8c12a.png?resizew=146)
(1)求作:等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8b1307079384bf7accebda3c826ef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8b1307079384bf7accebda3c826ef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f10681704c4fccfd37664eaf34391dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f10681704c4fccfd37664eaf34391dd.png)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f57b4a7c6b76deec4933c7f3e36850c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7889051aa8af62971598f2c3b081534.png)
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解答题-证明题
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【推荐2】如图,已知
、
是
的两条弦,且
,D是
延长线上一点,连接
并延长交
于点E,连接
并延长交
于点F.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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