如图,PC是⊙O的直径,PA切⊙O于点P,OA交⊙O于点B,连结BC.已知⊙O的半径为2,∠C=35°
![](https://img.xkw.com/dksih/QBM/2019/6/21/2230575426994176/2231263103787008/STEM/910ad761cb82415ea0db6cd99420d138.png?resizew=154)
(1)求∠A的度数;(2)求
的长.
![](https://img.xkw.com/dksih/QBM/2019/6/21/2230575426994176/2231263103787008/STEM/910ad761cb82415ea0db6cd99420d138.png?resizew=154)
(1)求∠A的度数;(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
2019·吉林长春·一模 查看更多[5]
【区级联考】吉林省长春宽城区2019届九年级中考模拟测试数学试题2019年河南省中考数学信息卷2019年浙江省杭州市拱墅区公益中学九年级中考数学三模试卷吉林省长春市长春净月高新技术产业开发区东北师范大学附属中学2019-2020学年九年级上学期期中数学试题(已下线)专题3.24 弧长和扇形面积(专项练习1)-2021-2022学年九年级数学下册基础知识专项讲练(北师大版)
更新时间:2019-05-22 21:01:05
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解答题-证明题
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【推荐1】如图,已知
是锐角
的外接圆,
,
是
的直径,
是
边上的高,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/20307943-814e-4380-ac84-e4f528377fbc.jpg?resizew=111)
(1)求证:
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/20307943-814e-4380-ac84-e4f528377fbc.jpg?resizew=111)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf750c6dfbdc5f6d40774e0d347e2deb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171fa1dca48260d03d56bee6374aa751.png)
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解答题-证明题
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【推荐2】如图,
,
为⊙O直径,弦
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分别交半径
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于点G,H,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/b638149a-de76-4f20-82a0-9560c29ffac3.png?resizew=151)
(1)求证:
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(2)若
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的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/b638149a-de76-4f20-82a0-9560c29ffac3.png?resizew=151)
(1)求证:
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42a6cc5c47d95cb8f91b88b313777ffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
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解答题-证明题
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【推荐1】如图,四边形
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(1)若
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(2)若
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解答题-作图题
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【推荐2】如图,在平面直角坐标系中,过格点
作一圆弧
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/1/fdd2590d-f7e0-404c-9e8a-811fe9a6c639.png?resizew=224)
(1)
所在圆的圆心
的坐标为______.
(2)求
的长(结果保留
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/1/fdd2590d-f7e0-404c-9e8a-811fe9a6c639.png?resizew=224)
(1)
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(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
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