Using only elementary geometry, determine angle x. Provide a step-by-step proof.
利用初等几何 求角 x. 写出求解过程.
The second inspect the two typical cases: computer proof of four-color conjecture and establishing of fractal geometry.
第二章考察了计算机在数学应用中的两个具体案例：四色猜想的计算机证明和分形几何的建立。
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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