摘要
运用解析方法对圆锥面曲线为椭圆时的投影进行了分析研究 ,明确了截交线投影在特殊情况下可以为圆 。
The projection of elliptic cone was studied by analytic method.It was found that at special conditions,the projection of interception line could be a circle.The position of interception plane relative to the axis was also define.
关键词
圆锥
截交线
投影特性
cone
Intercept in line
projection characteristic.
