在国内外数学竞赛试题中常常出现一类关于三角形构成问题的试题,这类试题所涉及的知识面较广,解答时需要一定的技巧和方法,通过对有关试题的仔细分析、研究后,现举出若干种方法例说如下。一、定理法所谓定理法就是利用构成三角形的有定理直接解答问题的方法。此方法对许多问题具有较强的实用性。 In the questions of mathematics competitions at home and abroad, a series of questions about the formation of triangles often appear. These questions involve a wide range of knowledge, and they require certain skills and methods. After careful analysis and study of relevant questions, Several examples are given below. First, the theorem law The so-called theorem law is to use the triangle forming theorem to directly answer the question. This method has strong practicality for many problems.