公切线是指同时相切于两条或两条以上的曲线的直线，例如和两个圆相切的直线叫做这两个圆的公切线。如果两个圆在公切线的同侧，则这公切线叫外公切线；如果两个圆在公切线的异侧，则叫内公切线。
给出了求解公切线的算法和网络搜索球机制的算法。
Given the algorithm for solving common tangent ball mechanism and network search algorithms.
讨论了圆的切线及两圆内外公切线的一般求法及步骤。
The general ways and procedures of working out internal and external co-tangents of circles are discussed.
在射影几何的范畴内，全面地论述了两二次曲线的公有点和公切线的图解问题。
This paper deals with the graphics of the intersections and common tangents of two conics according to projective geometry .
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