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本文利用斯特瓦特定理证明了如果一个三角形的两条内角平分线长相等,则此三角形是等腰三角形。并得到计算内角平分线长的公式。
This article uses the Stewart theorem to prove that if the two interior angles of a triangle have the same bisector length, the triangle is an isosceles triangle. And get the formula to calculate the bisector of the inner angle.