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本文利用三角形内心的两个性质,即张角公式和等量关系,解决平面几何中一些有关一条线段等于两条线段的和以及几何不等式等问题。
In this paper, we use the two properties of the inner triangle, namely the opening angle formula and the equal relationship, to solve some problems in plane geometry, such as the sum of two line segments and geometric inequalities.