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[几何] 顶点与中点相连，围成图形的面积是多少

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isee Posted 2014-9-5 20:57 |Read mode

平行四边形的每一个顶点分别与两条对边中点相连，如图。这些连线所围成图形的面积是平行四边形面积的几分之几？

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kuing Posted 2014-9-5 21:21

投影成正方形，比例不变……

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