如图,已知锐角
内接于⊙O,
于点D,连结AO.
⑴若
.
①求证:
;
②当
时,求
面积的最大值;
⑵点E在线段OA上,
,连接DE,设
,
(m、n是正数),若
,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4268b47e5cc678e714e2ee8ea51023a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7251d14111473460f02a65c7531c51f.png)
⑴若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151e84664b98fd51999758aaa807ae6e.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52705567101a48893de582656ef41527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
⑵点E在线段OA上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3aa1da9eef031c9562154530cbafb33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/006452bf101233fec9038889a73ba688.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3043fbfad5ed7d6259f7c33e7d7765e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f43db172d2cb1b3a0be584b39ae12b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4268b47e5cc678e714e2ee8ea51023a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/2a9fdd2c-a4fe-4f34-9a1a-f2733face2ac.png?resizew=134)
2019·浙江杭州·中考真题 查看更多[15]
浙江省杭州市2019年中考数学试题(已下线)专题10 图形的性质之解答题《备战2020年中考真题分类汇编》(浙江)湖南省长沙市天心区长郡集团郡维学校2019-2020学年九年级下学期第一次月考数学试题2020年四川省成都市中考数学复习试题湖南省株洲市渌口区2019-2020学年九年级下学期期中数学试题(已下线)【新东方】 绍兴数学初三下【00020】(已下线)专题3.17 切线长定理(知识讲解)-2021-2022学年九年级数学下册基础知识专项讲练(北师大版)2022年河南省中考数学模拟调研试卷2022年江苏省无锡市经开区中考二模数学试题江苏省无锡市江阴市云亭中学2021-2022学年九年级下学期5月月考数学试题河南省信阳市浉河区第九中学2022-2023学年九年级上学期12月月考数学试题江苏省仪征市实验中学东区校2022-2023学年九年级上学期10月月考数学试题2023年浙江省杭州市中考一模数学试题(已下线)2023年杭州一模(几何综合3)福建省龙岩市上杭县第三中学2023-2024学年九年级上学期12月月考数学试题
更新时间:2019-06-20 21:36:22
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【推荐2】已知△ABC中,∠A=60°,∠ACB=36°,D为BC边延长线上一点,BM平分∠ABC,E为射线BM上一点.
①若CE
AB,求∠BEC的度数;
②若CE平分∠ACD,求∠BEC的度数.
(2)若直线CE垂直于△ABC的一边,请直接写出∠BEC的度数.
①若CE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
②若CE平分∠ACD,求∠BEC的度数.
(2)若直线CE垂直于△ABC的一边,请直接写出∠BEC的度数.
您最近一年使用:0次
解答题-问答题
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【推荐1】如图,已知
是
的平分线,
是射线
上一点,
.动点
从点
出发,以
的速度沿
水平向左作匀速运动,与此同时,动点
从点
出发,也以
的速度沿
竖直向上作匀速运动.连接
,交
于点
.经过
三点作圆,交
于点
,连接
.设运动时间为
,其中
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/7bb5ca87-1bbc-4928-9135-62730b56f145.png?resizew=224)
(1)求
的值;
(2)当
时,求出
内切圆的半径;
(3)求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8af784c9dfea750943c747b9b363837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827e3b16a6a516da34a8d465c2eb8802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9174c3b1324cf81098e42e0480bcc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9174c3b1324cf81098e42e0480bcc8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be99fa94a1f3e4964fcc13a14fab9ba5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2cd1a272dd483dc289292f31497c86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be99fa94a1f3e4964fcc13a14fab9ba5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fad8891b60ed8a397fc7b2035ce864a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fb80b591b497d8d7a6d8592160de44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c89abbaa3b3b81386ce756eaa26c8d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/7bb5ca87-1bbc-4928-9135-62730b56f145.png?resizew=224)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9e32aae7b7c2e1f0deb5b25693c548e.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66884efff7400f92b530d69d029778d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
(3)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31ebabbf6a3b6da882eb237eefd61b26.png)
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解答题-证明题
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适中
(0.65)
解题方法
【推荐2】如图,以Rt△ABC的AC边为直径作⊙O交斜边AB于点E,连接EO并延长交BC的延长线于点D,点F为BC的中点,连接EF和AD.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/c155d8a2-ecf1-47a4-b57e-9c4f6f9be893.png?resizew=179)
(1)求证:EF是⊙O的切线;
(2)若⊙O的半径为2,∠EAC=60°,求AD的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/c155d8a2-ecf1-47a4-b57e-9c4f6f9be893.png?resizew=179)
(1)求证:EF是⊙O的切线;
(2)若⊙O的半径为2,∠EAC=60°,求AD的长.
您最近一年使用:0次