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贵刊2002年第9期《中线长定理的证明与妙用》一文,给出了中线长定理证明过程,并巧妙地应用于一道作图题.其实,平面几何中带有中线的问题,一般都可用中线长定理解决,尤其在处理比较复杂的证明题时,更是所向披靡.游刃有余. 中线长定理若AO是△ABC的一条中线,那么
In the article “Proof and Magical of the Long Theorem of the Middle Line” published in your magazine, No. 9, 2002, the process of proving the long theorem of the middle line is presented and applied skillfully to a drawing problem. In fact, the problem of the middle line in the plane geometry is generally The middle line length theorem can be used to solve, especially when dealing with more complex proving questions, it is more invincible. The long middle line theorem if AO is a midline of △ABC, then