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[几何] 以$z_1,z_2,z_3$为顶点的三角形是等腰直角

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hbghlyj posted 2022-12-30 21:19 |Read mode
若 $z_1, z_2, z_3$ 为等腰直角三角形的三个顶点,其中 $z_2$ 为直角顶点的充要条件为$z_{1}^{2}+2 z_{2}^{2}+z_{3}^{2}=2 z_{2}\left(z_{1}+z_{3}\right)$.
利用复数乘积的几何意义(对应于向量的旋转性)即可证明.

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