The formula of the curve tangent slope at some peculiar point in the orthograph on the stereoscopic surface intersecting line and the method of making tangent are given as well.
本文通过可展曲面的微分不变量,导出可展面的曲率线与曲率特征,并以锥面和切线曲面为例阐明这些特性的几何意义。
Intersecting lines
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Intersection (Euclidean geometry)
（重定向自Intersecting lines）
In geometry, an intersection is a point, line, or curve common in two or more objects (such as lines, curves, planes, and surfaces). The most simple case in Euclidean geometry is the intersection points of two distinct lines, that is either one point or does not exist if lines are parallel.