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通过对一个比较典型的图例，并对平面图形中各类线段（主要是圆弧线段）的分析方法和定性原则作了一个新的提示。这一提示适合对各种圆弧连接平面图形中各类线段的分析和定性。具有一定的普遍性。
Through a typical example, and a variety of lines in the plane graph (mainly arc segments) analysis methods and qualitative principles made a new hint. This hint is suitable for the analysis and characterization of various types of line segments in a variety of circular arc connection plane figures. Has a certain degree of universality.