求点到面,直线与平面或异面直线间的距离,通常转化为点到面的距离.其中的关键是确定点在面上的射影,这里.可利用向量的方法来确定:在平面内设出垂足的坐标,由四点共面的性质和线面垂直的性质列出方程组,即可解出垂足的坐标 To find the point to the surface, the distance between a straight line and a plane or a non-planar straight line usually translates into a point-to-area distance. The key is to determine the point-to-face projection. Here, we can use the vector method to determine: Set up the coordinates of the feet, list the equations by the nature of the four coplanarities and the nature of the vertical lines, and you can solve the coordinate of the foot