(本题满分8分)如图,在⊙O中,AB为直径,AC为弦,AD为切线,A为切点,
,垂足为E,交⊙O于点F,连接OF.
(1)试说明:
;
(2)若AC=16,
,求AB的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a11c1db76cc7e1894f74a50d71736455.png)
(1)试说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a1ef32bcb25f09c76ac530385639c3.png)
(2)若AC=16,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af69ccd4919a013c5a5b46ebe5cfc0f.png)
![](https://img.xkw.com/dksih/QBM/2020/8/5/2521161745859584/2521262535720960/STEM/cf995d4d24e04555ae9557e24f5ea1e8.png?resizew=131)
2020·江苏苏州·模拟预测 查看更多[4]
更新时间:2020-08-05 13:44:40
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解答题-问答题
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适中
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【推荐1】已知抛物线
与x轴相交于
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两点,与y轴交于点
.
(1)请直接写出
______,
______,
______,对称轴为______;
(2)如图1,点C和点D关于对称轴对称,连接
、
、
,E为抛物线上异于点C一动点,若
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(3)如图2,连接
,M为
上方抛物线上一动点,作
交
于N,求
的最大值及点M的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ef03f452410ab19c6246567c427178.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c052d7af2f98d95bac8725b608fba0fc.png)
(1)请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
(2)如图1,点C和点D关于对称轴对称,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41834ee3c8b047958a5be9022b2f91c0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/20/f0bc72a9-7927-4c38-b022-04e4f12660fc.png?resizew=140)
(3)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14f6a4655bce1c87a45cb6e69a011dd4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/20/0e9cca5f-0181-4349-8ea8-a2711a3af28d.png?resizew=139)
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解答题-问答题
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适中
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【推荐2】如图,已知等边三角形ABC的边长为6cm,点P从点A出发,沿A→C→B的方向以2cm/s的速度向终点B运动,同时点Q从点B出发,沿B→A的方向以1cm/s的速度向终点A运动.当点P运动到点B时,两点均停止运动.运动时间记为
,请解决下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/29/a7824c56-e6ed-4d57-b786-f1d4a0d90d77.png?resizew=386)
(1)若点P在边AC上,当
为何值时,
APQ为直角三角形?
(2)是否存在这样的
值,使
APQ的面积为
cm2 ?若存在,请求出
的值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/29/a7824c56-e6ed-4d57-b786-f1d4a0d90d77.png?resizew=386)
(1)若点P在边AC上,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(2)是否存在这样的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解答题-作图题
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【推荐1】如图,AB 是⊙ O 的直径,点 C 是⊙ O 上的一点,点 D 是弧 BC 的中点,连接 AC, BD,过点 D 作 AC 的垂线 EF,交 AC 的延长线于点 E,交 AB 的延长线于点 F..
(1)依题意补全图形;
(2)判断直线 EF 与⊙ O 的位置关系,并说明理由
(3)若 AB=5,BD=3,求线段 BF 的长
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/2/0549e14a-2778-4383-9bec-cdcceab44b25.png?resizew=125)
(1)依题意补全图形;
(2)判断直线 EF 与⊙ O 的位置关系,并说明理由
(3)若 AB=5,BD=3,求线段 BF 的长
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解答题-证明题
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适中
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【推荐2】如图,以
的边AB为直径作⊙O,交AC于点D,过点D作⊙O的切线DE,且
,垂足为E.
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988573209272320/2991809782784000/STEM/9948fd8d-9b14-4e2c-bbd8-7f616e7cf20a.png?resizew=143)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1393308bc68322f50fa29702dd412263.png)
(2)若⊙O的半径为5,
.求AC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988573209272320/2991809782784000/STEM/9948fd8d-9b14-4e2c-bbd8-7f616e7cf20a.png?resizew=143)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1393308bc68322f50fa29702dd412263.png)
(2)若⊙O的半径为5,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a2c0fa960a7a343096bdb66bb11285b.png)
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