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北师大版九年级数学上册教材第一章中提到:在一个三角形中,连接任意两边中点的线段叫做三角形的中位线.三角形中位线平行于第三边,且等于第三边的一半.
In the first chapter of the Beijing Normal University’s Grade 9 mathematics textbook, it is mentioned that in a triangle, the line segment connecting any two midpoints is called the triangle’s median line. The triangle’s median line is parallel to the third edge and equal to the third edge. Half of it.