在中考试题中,几何计算问题是常见的题型,它把几何知识与代数知识有机地结合起来,突出了数形结合思想。这类问题,有的直接利用有关概念、公式进行计算,但更多的是结合图形性质,利用三角形全等、三角形相似、垂径定理、切割线定理等,通过合理的推理论证,得出相关的结论,然后列式计算。这里要注意两点:一是列式计算前要以推理论证为基础,二是求得的 In the middle examination, geometric calculation is a common question type. It combines the geometric knowledge with algebraic knowledge organically and highlights the idea of ​​combination of numbers and shapes. Some of these problems are directly calculated using related concepts and formulas, but they are more combined with the nature of graphs. They use triangle congruence, triangular similarity, vertical diameter theorem, cutting line theorem, etc. The conclusions are then calculated by columns. There are two things to note here: one is that the calculation of the column formula should be based on the theory of inference, and the other is the