抛物线关于切线的性质及其在作图中的应用

Property of parabola about tangent and its application in construction

利用代数法证明了过平面上一点抛物线切线的存在性问题.给出了抛物线有关切线的几条新 性质,得到了作抛物线切线的新方法.

In this paper,it is proved that the existence problem of parabola's tangent through arbitrary point on plane by using the methods of algebraic,and some new property of parabola about tangent has been obtained. Further, we also give a new method of construction for parabola's tangent.