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[几何] 等轴双曲线的切线是陪位中线

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hbghlyj Posted 2025-1-7 21:39 |Read mode
AB的中点为O,
等轴双曲线的中心为O并且经过A、B、C,
作等轴双曲线在C的切线
求证:图中的两个角相等

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 Author| hbghlyj Posted 2025-1-7 21:49

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 Author| hbghlyj Posted 2025-1-7 22:19

中心为AB中点并且经过A、B、C的等轴双曲线 就是AB的中垂线的等角共轭!

对象重心坐标
$AB$的中点$(1:1:0)$
$\angle ACB$的角平分线与外接圆交点$(a: b: \frac{-c^2}{a + b})$
$AB$的中垂线$c^2 (x -  y) + (a^2 - b^2) z = 0$
$AB$的中垂线的等角共轭$c^2 (\frac{a^2}x -\frac{b^2}y) + (a^2 - b^2)\frac{c^2} z = 0$

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2025-6-5 19:39 GMT+8

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