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求异面直线距离的常用方法有两个:一是通过寻找平行平面把问题转化为求直线与平面的距离;二是根据异面直线的距离是分别在这两条直线上的两点间距离的最小值,用代数方法求这个最小值。本文提出另一种方法,用一个公式可以直接求得异面直线的距离。为了行文的需要,我们先介绍几个预备知识。预备知识一:直二面角P-AA'-Q的两个面
There are two commonly used methods to find the straight line distance between different surfaces: one is to find the parallel plane to convert the problem into the distance between the straight line and the plane; the other is the distance between the two straight lines according to the distance between two straight lines The minimum, using algebraic method to find the minimum. This paper presents another method, using a formula can be directly obtained from the distance of the straight line. For the sake of writing, let's introduce a few preliminary knowledge. Preliminary Knowledge One: The two sides of the straight dihedral P-AA'-Q