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有关60°、90°、120°的圆周角的平分线问题经常出现在我们的试卷中,笔者总结出两条结论,对我们解答有关问题很有帮助.
The problem of bisectors about the circumferential angles of 60 °, 90 °, and 120 ° often appears in our papers. The author concludes two conclusions which are very helpful for us to answer the relevant questions.