chord theorem
弦定理
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In this paper, the existence theorem of midpoint chord of quadratic curve, as well as its proof, is given via methods of projective geometry and polarity principle.
文章利用射影几何方法及配极原理给出二次曲线中点弦存在性定理的证明。
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