如图,
是
的直径,C点在
上,
平分角
交
于D,过D作直线
的垂线,交
的延长线于E,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/3/fb67f296-a1e3-4fcd-b04d-5c8c5a88d8a6.png?resizew=122)
(1)求证:
;
(2)求证:直线
是
的切线;
(3)若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e0b78b3160109f0f82268936f529a4d.png)
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/146a63bac5ecd239f2696801e8eaa0b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532b3981b59bbc3bd1a3fe16f92a3027.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/3/fb67f296-a1e3-4fcd-b04d-5c8c5a88d8a6.png?resizew=122)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe80c5f1fc28ab4a39c2197406bcffa1.png)
(2)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e0b78b3160109f0f82268936f529a4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d527d4795ece4a5756d1cf8dba31e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
更新时间:2024-02-03 12:36:00
|
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解答题-作图题
|
较易
(0.85)
名校
【推荐1】如图1,
中,
,
,
,在
上取一点
,使得
,过点
作
交
于点
,将
绕点
顺时针旋转
得
,连接
.
(1)若点
恰好落在线段
上,请在图1中补全图形,并证明
;
(2)如图2,若点
不在线段
上,连接
并延长,与
的延长线交于点
,当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac99c0358497d72001cc575f1ade329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65506f67160f70a0a38218b630a499a9.png)
(2)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac99c0358497d72001cc575f1ade329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56e3ece4dce20324f55badd3d9225e19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23cb8e9ca4aa25b883dda0eb9a19ca35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/673bec43a12cd2772b23afc7a14fd641.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23cb8e9ca4aa25b883dda0eb9a19ca35.png)
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解答题-证明题
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【推荐1】如图,已知
是
的直径,
是
上一点,点
、
在直径两侧的圆周上,若
平分
,求证:劣弧
与劣弧
相等.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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解答题-证明题
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【推荐2】如图,在⊙O中,
,∠ACB=60°,
求证∠AOB=∠BOC=∠COA.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5142949086fdc50bacd01b9ab9202320.png)
求证∠AOB=∠BOC=∠COA.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/70abef6a-aaa6-410d-82e0-5461ef03dd62.png?resizew=116)
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解答题-证明题
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【推荐2】
ABC中,
,点D为AC中点,过点D作
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![](https://img.xkw.com/dksih/QBM/2022/4/7/2953139570753536/2956665155264512/STEM/595177d3-4277-484d-8f90-25c47249ea01.png?resizew=174)
(1)求证:AB是⊙O的切线;
(2)若
,
,求BC的长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
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(1)求证:AB是⊙O的切线;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42bde65c6dbf99398fc27b922904967d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82773737609e65dea3c5c67099f1b10d.png)
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