摘要
运用图示法与解析法,就圆锥表面截交线中椭圆长轴为定长时,椭圆中心及椭圆短轴的变化规律,进行了分析和探讨,为圆锥表面截交线的作图提供了理论依据。
By using the diagramatic method and the analytic method,this paper deals with the regularity of the center and the shortest dimension of an ellipse when the longest dimension of the ellipse of a conic section is fixed.Thus it provides theoretical basis for drawing of a conic section.