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设O点在ΔABC内或外部,则O对顶点B和C的张角∠BOC与三角形的内角有何关系呢?本文介绍几个有用的结论.
Let O be in or outside ΔABC, then what is the relationship between the angle ∠BOC of O and vertex B and C and the inner angle of the triangle? This paper introduces several useful conclusions.