已知正四棱柱
中,
,E为
的中点,P为棱
上的动点,平面
过B,E,P三点,有如下四个命题:
①平面
平面
;
②平面
与正四棱柱表面的交线围成的图形一定是四边形;
③当P与A重合时,
截此四棱柱的外接球所得的截面面积为
;
④存在点P,使得AD与平面
所成角的大小为
.
则正确的命题个数为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e213c120b525e41b8156c8bd51d5168f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
①平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa807136194c18d3ac58902c67f9333.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914d46f7e72b55d2ff3d9bc38e02b31d.png)
②平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
③当P与A重合时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c282794d917604db40da9d6fb9443fb.png)
④存在点P,使得AD与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
则正确的命题个数为( ).
A.1 | B.2 | C.3 | D.4 |
21-22高三下·广西南宁·阶段练习 查看更多[2]
更新时间:2022-05-23 16:41:44
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
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【推荐2】如图,点P在正方体
的面对角线
上运动(P点异于B,
点),则下列四个结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/7384ad9e-5bda-47f9-9df6-89ca89a1186c.png?resizew=147)
①三棱锥
的体积不变;
②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0ff310aabd2282b539537ebed3f788.png)
平面
;
③
;
④平面
平面
.
其中正确结论的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/7384ad9e-5bda-47f9-9df6-89ca89a1186c.png?resizew=147)
①三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ad99ef5e70de37345c708b758d545f.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0ff310aabd2282b539537ebed3f788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d738aec61fee6269dbf8fc9fbd09c276.png)
④平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecb955df71b56b325021d2552303285f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
其中正确结论的个数是( )
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次