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

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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已知四边形ABCD和对角线ACBD顺次连接各边中点得四边形MNPQ给出以下6个�题�若所得四边形MNPQ为矩形则原四边形ABCD为 sketch template

已知EFGH分别是四边形ABCD各边的中点如图所示．1探究四边形EFGH的形状并证明2当四边形EFGH是正方形时请指出 sketch template

1如图�点O是四边形ABCD内一点连接OAOBOCOD可以得到4个三角形三角形个数与边数关系是相等依此类推则O是n边形内 sketch template

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6．如图四边形ABCD中AC=6BD=8且AC⊥BD顺次连接四边形ABCD各边中点得到四边形A1B1C1D1再顺次连接四边形 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�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

如图所示在任意凸四边形 ABCD 中取各边的中点并与它相对的一个顶点连结那么所围成的中央四边形面积与�围那四个阴影三角形的面积总和相等吗 sketch template

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顺次连接下列四边形各边的中点所得的四边形为矩形的是 A．等腰梯形B．矩形C．菱形D．平行四边形E．等腰梯形——青夏教育精英家教�—— sketch template

顺次连接四边形ABCD各边中点得到四边形EFGH要使四边形EFGH是菱形应添加的条件是AAD∥BCBAC=BDCAC⊥BDDAD sketch template

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如图四边形ABCD的面积为3EF为边AB的三等分点MN是CD边上的三等分点求四边形EFNM的面积．题目和参考答案——青夏教育精英 sketch template

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