为什么三角形中线组成的三角形面积等于这个三角形面积的 34？百度上写的，在性质的最后一行？ 知乎 Sketch Coloring Page

为什么三角形中线组成的三角形面积等于这个三角形面积的 34？百度上写的，在性质的最后一行？ 知乎 Template

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