几何题目千变万化,学习几何就是要在变化中研究不变的规律。对于一个题目,要善于把它的条件和结论进行变换,或引申、或拓展、或改编,增加发散的成分。这样,做一道题目就等于掌握了一个类型的题,对于培养创新思维是十分有利的。下面以初三几何94页例3为例说明。例3已知:AB是⊙O The ever-changing geometric problems, learning geometry is to study the invariable laws in the changes. For a topic, one must be good at transforming its conditions and conclusions, or extending, expanding, or adapting, to increase the divergence. In this way, to do a topic is equivalent to mastering a type of question, which is very beneficial to fostering innovative thinking. The following is an example of the third-generation geometry page 94 example 3 as an example. Example 3 is known: AB is ⊙O