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三角形中位线定理是三角形的一个重要性质,在学习这条定理的过程中,应注意以下几点: 1.把三角形中线与三角形中位线加以区别.这二者只有一字之差,它们的不同点是:“三角形的中线”指的是连结三角形的一个顶点和它对边中点的线段;“三角形的中位线”指的是连结三角形两边中点的线段.而这两个概念又有共同点:一都是线段;二每一个三角形都有三条中线,也都有三条中位线.
The triangle median line theorem is an important property of the triangle. During the process of learning this theorem, we should pay attention to the following points: 1. Distinguish the triangle centerline from the triangle centerline. There is only one word difference between these two. The difference is: “The triangle’s centerline” refers to the line connecting one of the vertices of the triangle and the midpoint of its opposite side; the “middle line of the triangle” refers to the line connecting the midpoints of the two sides of the triangle. These two concepts They have in common: one is a line segment; two triangles have three midlines, and three median lines.