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几何命题千变万化,添加辅助线不可能有一个万能公式,但是,在具体的命题条件下,也是有规律可循的,下面分类探讨,供大家中考复习时参考.一、有关边角关系的问题 在三角形边角关系定理的基础上,常常可以推断一些线段与角的大小关系比较问题.对这类命题添加辅助线的主要思考途径是:将不属于同一个三角形的线段与角的元素化为同一个三角形的边角元素.
Geometric propositions are ever-changing, and there is no universal formula for adding auxiliary lines. However, under the specific propositional conditions, there are also rules that can be followed. The following classifications are discussed for reference when reviewing. I. Problems concerning the relationship between corners and corners Based on the triangle edge relation theorem, it can often be inferred that some line segments and angles are related to each other. The main way to add auxiliary lines to these types of propositions is to elementize line segments and angles that do not belong to the same triangle. A triangular corner element.