已知椭圆
的左右焦点为
,过点
的直线交椭圆
于
两点,则
的周长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1d0d75f5a2c5c8383c860fbf915fb11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40f98254a6193566587a70c7d95fdabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5eb2485f90dbfd0dfd6e7d179a856f5.png)
21-22高二上·重庆渝中·阶段练习 查看更多[3]
更新时间:2022-03-28 10:47:56
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【知识点】 椭圆中焦点三角形的周长问题
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解题方法
【推荐1】已知椭圆
的右焦点为
,设
是椭圆
上的两个动点,且
,则当
取得最大值时,
的周长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9bf37fb661ccc2fdd67407269708df4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ca58b14f9bbdbc3204f6f330525943.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8206a65a3443caa685e4de3112eca291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fea5f7430235e65d2c2e6b2ecc46712.png)
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【推荐2】已知椭圆
的左焦点为
是
上关于原点对称的两点,且
,则
的周长为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5023d88e11dce13bd4a64de92165bcf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76eb4c5063bea91ccce9027e0874f1a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/243a9ae75886b75c37f88a0ba655fa31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
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