如图,点A、B、C在⊙O上, AB=CB=9, AD∥BC,CD⊥AD,且AD=2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/c6569291-a411-4fe0-8425-8ab69a663e62.png?resizew=132)
(1)求线段CD、AC的长;
(2)求⊙O的半径.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/c6569291-a411-4fe0-8425-8ab69a663e62.png?resizew=132)
(1)求线段CD、AC的长;
(2)求⊙O的半径.
更新时间:2022-07-22 22:53:37
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真题
【推荐1】我市的前三岛是众多海钓人的梦想之地.小明的爸爸周末去前三岛钓鱼,将鱼竿
摆成如图1所示.已知
,鱼竿尾端A离岸边
,即
.海面与地面
平行且相距
,即
.
(1)如图1,在无鱼上钩时,海面上方的鱼线
与海面
的夹角
,海面下方的鱼线
与海面
垂直,鱼竿
与地面
的夹角
.求点O到岸边
的距离;
(2)如图2,在有鱼上钩时,鱼竿与地面的夹角
,此时鱼线被拉直,鱼线
,点O恰好位于海面.求点O到岸边
的距离.(参考数据:
,
,
,
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd66854d3a2d397beb0e31aa2102a31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f988fbab729c370acabf2fb63cb7559.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b0e78b35ed431026e82402823c3744f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01f8039a874d818f0067ad4dc93bdd33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/551abfb73661d53aac8638cefddb6708.png)
(1)如图1,在无鱼上钩时,海面上方的鱼线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e0ae50d5993a332b5cddb022eaa6f1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec7e3a486e8b9cbf78323e87f8ea0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e0ae50d5993a332b5cddb022eaa6f1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24072fd120fcec1b5ccf089b626c4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
(2)如图2,在有鱼上钩时,鱼竿与地面的夹角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df34f0e0d972b58772bfcd5997ca93b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/402537ee76e8b7781e860012e267fd80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe7e780742a4dc9d7dfb5d4d1adc9bf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70c9b1f0a159e6cfcad25890ee66626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c8d86d304069fb4b15ca518ad55d25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a6838c68ce0b6821536d4e168d4823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f49328408982f411cd32c5326289997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c480c2d133edba72891035661875ea30.png)
![](https://img.xkw.com/dksih/QBM/2021/6/17/2744710574964736/2745082490028032/STEM/c0a94b14-4888-43d0-9d7b-ba0f7e949ea0.png)
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【推荐2】如图,
于
,
交
于
,
,
.
(1)求证:
;
(2)求证:
;
(3)当
,
时,直接写出线段
、
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c690095abb1ed7f367163650c1cd9826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b37b9f085e8957af0895309f4418b2f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b92156cb73a6fe1265d30e189fe3dae3.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b62ce0cbffa4758c7a0e6fb7ca4d24e.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72011ad18bb305781ed985130b43766e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e21f8d8dc589d0e945d8e6b8cea7bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/854e8fec-f498-4c90-944e-d8d6faa9a27a.png?resizew=220)
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【推荐1】越来越多太阳能路灯的使用,既点亮了城市的风景,也是我区积极落实节能环保的举措.某校学生开展综合实践活动,测量太阳能路灯电池板离地面的高度.如图,已知测倾器的高度为
米,在测点A处安置测倾器,测得点M的仰角
,在与点A相距3米的测点D处安置测倾器,测得点M的仰角
(点
与N在一条直线上).(参考数据:
)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/7757bb9b-1149-4d22-adf8-fbd6799e248e.png?resizew=192)
(1)求
的度数:
(2)求电池板离地面的高度
的长.(结果精确到1米)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8f58755aee89fb2cf72ba518dcee2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f074dda7325c22cc2078c9404447dbe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9771c6d7120edfb9777d07afcc7112a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663aa29cf0f19e37809eb6ea70c4e767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7a498e12dd53668e5ae33bedacd15b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/7757bb9b-1149-4d22-adf8-fbd6799e248e.png?resizew=192)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4067b50a6aa2a6462f1d9df4b093f66.png)
(2)求电池板离地面的高度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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【推荐2】在平面直角坐标系中,过A(0,4)的直线a垂直于y轴,点M(9,4)为直线a上一点,若点P从点M出发,以每秒2cm的速度沿直线a向左移动,点Q从原点同时出发,以每秒1cm的速度沿x轴向右移动,
(1)几秒后PQ平行于y轴?
(2)在点P、Q运动的过程中,若线段OQ=2AP,求点P的坐标.
(1)几秒后PQ平行于y轴?
(2)在点P、Q运动的过程中,若线段OQ=2AP,求点P的坐标.
![](https://img.xkw.com/dksih/QBM/2021/12/27/2881387214626816/2882495504728064/STEM/bffe7237-4509-4d28-bf32-1e89b6155805.png?resizew=182)
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【推荐1】如图,
是
的直径,
,垂足为E,直线
与圆相切于点C,
交
于点D,直线
交
的延长线于点P,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/9db8552c-659e-4bd5-9dd1-1849fb26addb.png?resizew=208)
(1)求证:
平分
;
(2)若直径
为10,
,求
长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c21962141bf9b2606c255ece8d3e0e34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/9db8552c-659e-4bd5-9dd1-1849fb26addb.png?resizew=208)
(1)求证:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
(2)若直径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐2】如图,以
的
边上一点O为圆心的圆,经过A、B两点,且与
边交于点E,D为
的下半圆弧的中点,连接
交
于F,若
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/4f249c58-95cf-41b7-81dc-95551d456347.png?resizew=201)
(1)求证:
是
的切线;
(2)若
,
,求阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f0cca1dc58405ba9948294ae73080e4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/4f249c58-95cf-41b7-81dc-95551d456347.png?resizew=201)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a690535ef8766d108cce93b9e8544311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb08f6a798dc293f3d8de281190f65e.png)
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解答题-证明题
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适中
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【推荐1】如图,四边形
内接
,
为
直径,连接
.作
交
延长线于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/17/9b0c81ed-eeec-4e3f-8940-03abac45ccc0.png?resizew=168)
(1)求证:
为
切线;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e9a03bfdcbdab25a20f431df4eeb7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/17/9b0c81ed-eeec-4e3f-8940-03abac45ccc0.png?resizew=168)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/025df2a9934b457cf20d91604e430612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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【推荐2】阅读与思考
学习了圆的相关知识后,某数学兴趣小组的同学们进行了如下探究活动,请仔细阅读,并完成相应任务.
任务:
(1)上述阅读材料中①处应填的内容是________,②处应填的内容是_______.
(2)兴趣小组的同学们继续思考,当直线AE与圆相切时,是否仍有类似的结论.请将下列已知、求证补充完整,并给出证明.
已知:如图,A是
外一点,过点A的直线交
于点B,C,__________.
求证:
___________.
学习了圆的相关知识后,某数学兴趣小组的同学们进行了如下探究活动,请仔细阅读,并完成相应任务.
割线定理 如图,A是![]() ![]() ![]() ![]()
![]() ∵ ![]() ![]() ∴ ![]() ∴ ![]() ∴ ![]() |
(1)上述阅读材料中①处应填的内容是________,②处应填的内容是_______.
(2)兴趣小组的同学们继续思考,当直线AE与圆相切时,是否仍有类似的结论.请将下列已知、求证补充完整,并给出证明.
已知:如图,A是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a15d1d216e47f797d0832ee80f50f01.png)
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