如图,⊙
的半径
于点
,连接
并延长交⊙
于点
,连接
.若
,则
的长为 ___ .
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2016·广西南宁·一模 查看更多[9]
2016届广西南宁市马山县中考一模考试数学试卷四川省自贡市2016-2017学年上学期九年级期末统一考试数学试题2018吉林中考数学全真模拟(五)新人教版九年级上册《第24章 圆》单元测试卷四川省阿坝州汶川县2019-2020学年九年级上学期期末考试数学试题四川自贡蜀光绿盛实验学校2020-2021学年九年级上学期第三次月考数学试题湖北省十堰市房县2020-2021学年九年级上学期期末数学试题(已下线)3.3垂径定理(重点练)-2020-2021学年九年级数学下册十分钟同步课堂专练(北师大版)(已下线)专题3.12 垂径定理专题训练(巩固篇)(专项练习)-2021-2022学年九年级数学下册基础知识专项讲练(北师大版)
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【推荐2】下面是“用三角板画圆的切线”的画图过程.
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(2)如图3,将三角板的直角顶点与点A重合,使一条直角边经过点B,画出另一条直角边所在的直线AD.
所以直线AD就是过点A的圆的切线.
请回答:该画图的依据是______________________________________ .
如图1,已知圆上一点A,画过A点的圆的切线.
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(2)如图3,将三角板的直角顶点与点A重合,使一条直角边经过点B,画出另一条直角边所在的直线AD.
所以直线AD就是过点A的圆的切线.
请回答:该画图的依据是
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