已知双曲线
,过双曲线的上焦点
作圆
的一条切线,切点为M,交双曲线的下支于点
为
的中点,则三角形
的外接圆的周长为_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14a9bcbb1aefa9033e04a5a5d351bfe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a143573e9fe53e6a861154bf5b4c27c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557a0617c0406dd715e5cc30833b083c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d90a03b11a51bd7824aa4094526e5aec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3485e24c9c716300ac8a406ed88e6dd1.png)
23-24高三上·重庆南岸·阶段练习 查看更多[2]
重庆市第十一中学2024届高三上学期第一次质量监测数学试题(已下线)专题24 双曲线及其标准方程7种常见考法归类 - 【考点通关】2023-2024学年高二数学高频考点与解题策略(人教A版2019选择性必修第一册)
更新时间:2023-09-06 21:48:07
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【知识点】 利用定义解决双曲线中焦点三角形问题
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【推荐1】双曲线
的离心率是
,点
是该双曲线的两焦点,P在双曲线上,且
轴,则
的内切圆和外接圆半径之比![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bd05adb62374d8ee90daef4a823650c.png)
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【推荐2】已知双曲线
的离心率为3,
为双曲线的左右焦点,过右焦点
作平行于一条渐近线的直线交双曲线于点
,
的内切圆半径为
,则
=________ .
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