不少几何题,若由原图形分析,有时显得十分繁难,甚至会陷入困境.这时,若将原图形添补成一个特殊的、简单的、完整的新图形,则能使问题的本质得到充分的显示,从而能使问题化繁为简,起到事半功倍的作用.此类试题在竞赛中尤为广泛.现作简单介绍,供同学们参考. Many geometric questions, if analysed by the original figures, are sometimes very arduous and may even be in trouble. At this time, if the original figure is replenished into a special, simple and complete new figure, the nature of the problem can be fully realized. The display can thus simplify the problem and play a multiplier role. Such questions are particularly extensive in the competition. A brief introduction is provided for students’ reference.