从顶点向两侧伸长的两叶圆锥面和任一平面相交形成的到定点的距离与到定直线的距离比为常数e的曲线conic section

• 直线、圆、圆锥曲线这几种曲线方程是解析几何中常见的问题。

  Hyperbolic equations of straight lines, circles, and conic sections are common questions in analytical geometry.

• 圆锥曲线几乎是高考试题的必考内容。

  Conic sections are basically guaranteed to be tested in the college entrance exam.