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三角形中位线定理是:“三角形的中位线平行于第三边,并且等于它的一半”.课本(人教版初二几何)在证明“三角形中位线定理”时,采用了“同一法”,方法如下: 如图1,DE是△ABC的一条中位线.如
The triangle’s median line theorem is: “The triangle’s median line is parallel to the third side and equal to half of it.” The textbook (PEPJ geometry) uses the “identical” when proving the “triangle median line theorem.” The method is as follows: As shown in Figure 1, DE is a median line of △ABC.