摘要
在空间,选取适当的坐标系,求出任意平面截圆柱面所得曲线的统一方程,并就各种情况进行详细讨论,得出只有2平行直线、圆、椭圆这3种二次曲线的事实。
In the space, we' ll obtain a uniform equation of the cylindrical section if we elect a fitted coordihate system. And we'll discover the quadric curves including two parallels,circles and ellipses if we discuss the equation.
出处
《丽水学院学报》
2008年第5期72-74,共3页
Journal of Lishui University
基金
丽水学院教改重点资助项目(08JZ09)
关键词
圆柱曲线
平行线
圆
椭圆
二次曲线
the cylindrical section
parallel
circle
ellipse
the quadric curve