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本文提出应用球面辅助面的图解方法,求出圆环面的轮廓线。根据包络的概念解出轮廓线的方程式。从而得出结论:圆环面的轮廓线是封闭的椭圆等距曲线,而不是椭圆。
In this paper, the application of the spherical auxiliary surface graphic method to find the contour of the torus. According to the concept of envelope to solve the outline of the equation. It follows that the contour of the torus is a closed elliptical isometric curve, not an ellipse.