“补形法”就是根据题设的条件和图形,经过观察、分析和联想,运用添加辅助线的方法,将其拓展为范围更广的、其特征更明显、更为熟悉的几何图形,从而沟通条件和结论之间的联系。下面根据本人平时在教学中的经验,就“补形法”谈一谈它在解平面几 “Complementary method ” is based on the conditions and graphics of the subject, through observation, analysis and association, the use of auxiliary lines to add methods to expand it to a wider range of its more obvious characteristics, more familiar geometry , Thus linking the conditions of communication with the conclusion. The following according to my usual experience in teaching, on the “shape” talk about it in the plane a few