如图,在棱长为
的正方体
中,
分别是正方形
的中心,
在线段
上,
,则过点
的正方体的截面的面积是__ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97ce0bcac3e46682d2753f10d77d49d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d842190af1f6f3eb111111891de8534.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89fc107c4b33d6dd648b396156494ea9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/c2912cc3-aaf9-45f7-84de-68feeb6607a1.png?resizew=170)
更新时间:2023-02-02 10:48:19
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适中
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【推荐1】如图,已知在正方体
中,
,点
为
上的一个动点,平面
与棱
交于点
,截面四边形
的周长的最小值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/62fce37d-3fe2-46b1-866d-8d6c6ed5a912.png?resizew=162)
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【推荐2】已知正方体
的棱长为6,
、
分别是
、
的中点,平面
截正方体所得的截面为多边形,则此多边形的边数为___________ ,截面多边形的周长为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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解题方法
【推荐1】如图,在棱长为2的正方体中,
均为所在棱的中点,则下列结论正确的序号是
①棱上一定存在点
,使得
;
②三棱锥的外接球的表面积为
;
③过点作正方体的截面,则截面面积为
;
④设点在平面
内,且
平面
,则
与
所成角的余弦值的最大值为
.
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填空题-单空题
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适中
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【推荐2】已知长方体
中,
,点
为
的中点,且
,则平面
被长方体
截得的平面图形的周长为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d262480ffb55b7617f44b63f130c154a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2f7189846c1e42ef13d0c64290da1be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fed2f706801662432b68797e72647c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
您最近一年使用:0次
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名校
【推荐3】如图,已知在四棱锥
中,底面
是菱形,且
底面
,
分别是棱
的中点,对于平面
截四棱锥
所得的截面多边形,有以下几个结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/41811edf-8f4d-4db3-b213-6ee62fe8571f.png?resizew=187)
①截面的面积等于
;
②截面是一个五边形且只与四棱锥
四条侧棱中的三条相交;
③截面与底面所成锐二面角为
;
④截面在底面的投影面积为
.
其中,正确结论的序号是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c8c336bafb3d814f6c6ba433470a6e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ceba189c7a0d6e00ae52b8806ccb448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805fba552962d3389267f0ddf7fcf87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd66687a8c0d2d00ba430b040e9f647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/41811edf-8f4d-4db3-b213-6ee62fe8571f.png?resizew=187)
①截面的面积等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ee05b3210c8964deef8ff771173d288.png)
②截面是一个五边形且只与四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
③截面与底面所成锐二面角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
④截面在底面的投影面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa37aefb6d45efe4e20ba48c2e7dfa8.png)
其中,正确结论的序号是
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