线段的中点是几何图形中的一个特殊点.在解决与中点有关的问题时,如果能适当地添加辅助线、巧妙地利用中点,则是处理中点问题的关键.但由于含有中点条件问题的辅助线的作法灵活,不少学生难以掌握.本文拟就针对中点问题举例谈谈几种添加辅助线的方法.一、遇到中点作中线这种方法常用于解决直角三角形或等腰三角形的有关问题,主要是运用直角三角形斜边上的中线或 The midpoint of the line segment is a special point in the geometry.When solving the problem related to the midpoint, the key to dealing with the midpoint problem is to use the midline appropriately if it can be added appropriately.However, Point conditions of the auxiliary line flexible approach, many students difficult to grasp.This article is about the midpoint for example to talk about several ways to add auxiliary line. First, meet the midpoint of this method is commonly used to solve the right triangle Or isosceles triangle, the main problem is the use of the right triangle on the hypotenuse of the center line or