如图所示的正方体中,
、
分别是
,
的中点,
是正方形
的中心,则空间四边形
在该正方体面上的投影可能是________ .
![](https://img.xkw.com/dksih/QBM/2017/8/31/1764054029000704/1764716711763968/STEM/fea4662af8e14b3991a7124464cb03d4.png?resizew=554)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fbafedc202bd0d86c4dfdece9f8f4fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4af78cc1f43a2d72af194380711d02c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbad16d8800f6d55bd66bd64b1370e4a.png)
![](https://img.xkw.com/dksih/QBM/2017/8/31/1764054029000704/1764716711763968/STEM/fea4662af8e14b3991a7124464cb03d4.png?resizew=554)
更新时间:2017-09-01 16:28:15
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【知识点】 几何体正投影的形状
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【推荐1】下列说法中正确的个数是______ .
①正方形的平行投影一定是菱形;
②平行四边形的平行投影一定是平行四边形;
③三角形的平行投影一定是三角形.
①正方形的平行投影一定是菱形;
②平行四边形的平行投影一定是平行四边形;
③三角形的平行投影一定是三角形.
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【推荐2】如图,在正方体
中,
为
的中点,则
在该正方体各个面上的射影可能是( )
![](https://img.xkw.com/dksih/QBM/2014/11/10/1571892657143808/1571892662968320/STEM/3c9c727c94dc42f3912d88765c8c6b9d.png?resizew=158)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557a1bc648125cc09cb63412bc13ea1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ab13ef156d034b710d811e09b0be34.png)
![](https://img.xkw.com/dksih/QBM/2014/11/10/1571892657143808/1571892662968320/STEM/3c9c727c94dc42f3912d88765c8c6b9d.png?resizew=158)
![](https://img.xkw.com/dksih/QBM/2014/11/10/1571892657143808/1571892662968320/STEM/e51ae0892345435db8f27cc2e2beadbf.png?resizew=544)
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