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[几何] 一道平面几何

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hbghlyj posted 2020-1-18 19:19 |Read mode
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只说明了二次曲线,如何说明是双曲线呢,这是跟欧拉线有关的几何不等式吗

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original poster hbghlyj posted 2020-1-18 19:21
Last edited by hbghlyj 2020-1-18 20:39补充:以外接圆为单位圆建立复平面.
补充:$\triangle$ABC是不等边三角形,否则退化成两相交直线

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original poster hbghlyj posted 2020-1-19 13:15
【搬运】吃喝睡(184452879) 2020/1/19 13:03:25
外接圆的直径,总与外接圆有两个交点

【搬运】吃喝睡(184452879) 2020/1/19 13:04:16
所以这个等角共轭像,总是双曲线,而且,由于这两个交点是对径点,所以一定是等轴双曲线

但我试过如果换成别的直线它可以是椭圆?

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