文[1]提出了解决三角形中两倍角问题的四种方法,并列举了四个典型的例题加以阐述,读后受益匪浅.笔者进一步深入研究后发现,这四种方法竟然都可以用辅助圆的方法统一加以解决,并给出了相应的解题策略,现整理如下,与各位老师共交流. Wen [1] proposed four methods to solve the problem of double angle in triangle, and cites four typical examples to elaborate, which will benefit greatly after reading.In the further study, the author finds out that these four methods can all be used to assist Round method to be unified to solve, and gives the corresponding problem-solving strategy, are now organized as follows, with all the teachers exchange.