题型:解答题-问答题
难度:0.85
引用次数:56
题号:21078519
如图,在中,
,
垂直平分
,求
的度数.
更新时间:2023-12-11 21:46:14
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解答题-证明题
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【推荐1】如图,
中,
,点D在边
上,
,
,垂足为F,
交
于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/1/e528572b-2327-4b0d-b4cc-94f7316cc888.png?resizew=157)
(1)探究
与
的数量关系,并证明;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7099026716ee1821dd7d9f157dc055f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f5434406acfefc5690608f18a7e02d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c05986ad5fa244bc1aedf7b5d216544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/1/e528572b-2327-4b0d-b4cc-94f7316cc888.png?resizew=157)
(1)探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/387cb1a9bbf3452f9ead3697ce02eb0e.png)
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【推荐2】如图1,
中,
,点D在
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/1e9f09d4-5384-442d-8b3b-e48343677ff3.png?resizew=365)
(1)求∠A的大小;
(2)如图2,
于E,
于F,连接
交
于点H,求证:
垂直平分线段
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f665d7b67a52e6d408384dc07a5a457.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/1e9f09d4-5384-442d-8b3b-e48343677ff3.png?resizew=365)
(1)求∠A的大小;
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d276d0010fd458383ea3dd61415e1aa.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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解答题-作图题
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【推荐1】已知A村和B村座落在两相交河流流域内(如图所示).A,B两村计划合建一座引水站P,要求所建引水站P必须满足下列条件:①到两条河流岸边的距离相等;②到A,B两村的距离也相等.请你通过作图确定引水站P的位置.(要求:尺规作图,保留作图痕迹,不写作法)
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【推荐2】如图,已知在
中,
,
.
(1)作
的垂直平分线
,交
于点
;交
于的E(要求:尺规作图,保留作图痕迹,不必写作法和证明过程);
(2)连接
,若
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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(1)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
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【推荐1】如图,
,点
在AB上,
,
,
平分
交DE于点
.
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(2)写出证明(1)中猜想的思路.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/14/214385a6-4ddb-4bf5-a81a-b29e9851b6bd.png?resizew=196)
(1)猜想:CF与DE有什么位置关系?
(2)写出证明(1)中猜想的思路.
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解答题-证明题
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【推荐2】已知在△ABC中,D为边BC上一点,AB=AD=CD,BE平分∠ABC,交AC于点E.
![](https://img.xkw.com/dksih/QBM/2021/12/13/2871419137089536/2877147851259904/STEM/2e45bba8-3908-427f-9469-8d85a9c0a8d8.png?resizew=146)
(1)求证:∠ABC=2∠C;
(2)若AD平分∠BAC,求∠BAD的度数.
![](https://img.xkw.com/dksih/QBM/2021/12/13/2871419137089536/2877147851259904/STEM/2e45bba8-3908-427f-9469-8d85a9c0a8d8.png?resizew=146)
(1)求证:∠ABC=2∠C;
(2)若AD平分∠BAC,求∠BAD的度数.
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