证一个四边形，作出各边三等分点，连接对边对应三等分点，中间的小四边形是大四边形面积的九分之一（附图）知乎 Sketch Coloring Page

证一个四边形，作出各边三等分点，连接对边对应三等分点，中间的小四边形是大四边形面积的九分之一（附图）知乎 Template

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tomski证一个四边形，作出各边三等分点，连接对边对应三等分点，中间的小四边形是大四边形面积的九分之一（附图）知乎 coloring

证一个四边形，作出各边三等分点，连接对边对应三等分点，中间的小四边形是大四边形面积的九分之一（附图） 知乎 sketch template

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浅谈完全四边形性质 知乎 sketch template

浅谈完全四边形性质 知乎 sketch template

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如图�们把依次连接任意四边形ABCD各边中点所得四边形EFGH叫中点四边形．1若四边形ABCD是菱形则它的中点四边形EFGH一定是 sketch template

�们把顺次连接任意一个四边形各边中点所得的四边形叫做中点四边形．（1）任意四边形的中点四边形是什么形状？为什么？（2）任意平行四边形的中点四边 sketch template

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如图所示分别以直角三角形ABC三边为边�外作三个正方形其面积分别用S1S2S3表示若S1=25S3=9则S2的值为 A sketch template

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浅谈圆内接对角线垂直四边形 知乎 sketch template

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中考数学｜遇到三角形一边上中点，利用倍长中线法构造全等三角形 哔哩哔哩 sketch template

如图�分别以直角三角形ABC三边为直径�外作三个半圆其面积分别用S1S2S3表示 1 如图�分别以直角三角形ABC三边为 sketch template

如图把四边形ABCD改成一个面积和它相等的三角形小慧的作法如下1连接AC2过点D作AC的平行线与BC的延长线交于点E3 sketch template

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