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文[1]利用余弦定理及三角形面积公式推导出三角形中线长度计算面积公式:如果m,n,p分别是△ABC三边上的中线,那么
In [1], we use the cosine theorem and the triangle area formula to derive the area formula for calculating the length of the triangle’s centerline: if m, n, and p are the midlines on the three sides of △ABC, then