《课标》中对于空间观念这个学习领域的要求之一是能从复杂的图形中分解出基本的图形,并能分析其中的基本元素及其关系.而现在的中考题设计总是以一些基本图形背景,提炼基本图形中所隐含的性质,结论完成的.因此学生对于基本图形的理解直接影响到他们能否解决几何题.1“扣”基本图形出现一:例1如图1,已知Rt△ABC,∠ACB=90°,将△ABC One of the requirements for the concept of space in this course is to decompose the basic graphics from the complex graphics and to analyze the basic elements and their relationship.At present, the design of the middle school entrance examination is always based on some basic Graphics background, refining the basic graphics of the implied nature of the conclusion is completed, so the students understand the basic graphics directly affect their ability to solve the geometric problems.1 “buckle ” basic graphics appear one: Example 1 Figure 1 , Known Rt △ ABC, ∠ ACB = 90 °, △ ABC