解析几何里,求点到直线的距离,一般采用两种方法。一种是利用直线的法线式方程;另一种是求垂足,用两点间距离的公式。从教学的角度来看,这两种处理方法各有优缺点。 In analytical geometry, the distance from a point to a straight line is generally used in two ways. One is to use the normal equation of a straight line; the other is to calculate the distance between the two points by using a footing. From a teaching perspective, these two methods have their own advantages and disadvantages.