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[几何] 圆内接四边形的质心在外接抛物线的主轴上

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hbghlyj posted 2024-11-3 18:35 |Read mode
kuing 发表于 2024-3-31 06:55
`(\frac{x_1+x_2+x_3+x_4}4,\frac{y_1+y_2+y_3+y_4}4)` 称为“四个顶点的质心”。
如何证明该点$O=(\frac{x_1+x_2+x_3+x_4}4,\frac{y_1+y_2+y_3+y_4}4)$在外接抛物线的主轴上,当$ABCD$为圆内接四边形?

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original poster hbghlyj posted 2024-11-3 18:35
还有一个问题,外接抛物线为什么一定存在?

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