centre of conic section.
二次曲线心
Another Nature of Conic Section
圆锥曲线的又一性质
A Conic Section and a Straight Line
一条圆锥曲线和一条直线
A ratio describing the shape of a conic section.
描述圆锥曲线部分形状的比率。
A Note on A Method of Reducing Equation of Conic Section
化简圆锥曲线方程的一种方法的注记
The Note Solution of Asymptote Equations for Conic Section
关于射影几何渐近线方程的注记
Three expressions of conic section and central force problem
圆锥曲线的三种表示和有心力问题
On the Point of Intersection of Conic Section in Parameter Form
参数形式的圆锥曲线交点问题
The Research Of The Curve Formed By The Conic Section Rolled On Line
圆锥曲线沿直线滚动所形成曲线的研究
The Necessary Condition to Draw a Tangent Line from the Conic Section
圆锥曲线切线几何作图的充要条件
The Relation Between the Eccentricity of Conic Section and the Parameter
圆锥曲线离心率与参变量的关系
a fixed point whose relationship with a directrix determines a conic section
一个与准线的关系决定圆锥形状的定点
A fixed point whose relationship with a directrix determines a conic section.
焦点一个与准线的关系决定圆锥形状的定点
The Demonstration of the Conic Section Is an Envelope of Family of Straight Lines
圆锥曲线是直线族的包络的证明
the fixed curve traversed by a generatrix in generating a conic section or a cylinder
准线，穿过产生圆锥部分或圆柱的母线而形成的固定曲线
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