利用补形法解题,通常是把问题中已知的不规则的图形补画成基本图形(如等腰三角形、等边三角形、直角三角形、平行四边形、矩形、正方形等),再利用基本图形的性质或有关定理来简捷获解.那么,如何补形呢?下面介绍几种可操作的方法. The problem is solved by using the complement method. Usually, the irregular graphics known in the problem are complemented into basic graphics (such as isosceles triangles, equilateral triangles, right triangles, parallelograms, rectangles, squares, etc.) and the basic graphics are reused. The nature or related theorems are simply solved. Then, how to make up the shape? Here are some of the methods that can be manipulated.