关于点到空间直线距离公式的一个证明

A proof about a formula of the distance from a point to a straight line in space

利用一元函数极值的求法和有轴平面束方程理论,结合点到平面的距离公式给出空间中点到直线距离公式的一个证明.并利用这一方法给出平面中点到直线的距离公式.

By using the method of the function of one variable about the extreme value problem and the theory of the pencile of planes equation,we prove the formula of the distance from a point to a straight line in space.By using this method,it gives the formula of the distance from a point to a straight in plane.