如图,在底面为直角梯形的四棱锥
中,
平面
,
.求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffbb040ec738f33c48e2920af50df13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b514bbc1f194d807b0b445f066b9ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/7695554b-889a-480d-a3ad-4491b7484169.png?resizew=192)
2023高一·全国·专题练习 查看更多[2]
更新时间:2023-05-06 12:31:29
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【知识点】 证明线面垂直
相似题推荐
解答题-证明题
|
较易
(0.85)
解题方法
【推荐1】如图,在三棱锥
中,已知
是正三角形,
平面
为
的中点,
在棱
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/0753da9a-35a4-460b-ac49-4e9138678b98.png?resizew=194)
(1)求三棱锥
的体积;
(2)求证:
平面
;
(3)若
为
中点,
在棱
上,且
,求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f010b76578240c9efbbe0bc173d24714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee283c8b16bb83aa6119be01186bcf0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/457eb716c608c6b4fb6e91c8fc2ed163.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/0753da9a-35a4-460b-ac49-4e9138678b98.png?resizew=194)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2239d3ef65845a7855c84932428bf079.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eaa5e336f830a3e5cd60ff7a756f3ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
名校
解题方法
【推荐2】在边长为
的正方形
中,
分别为
的中点,
分别为
的中点,现沿
折叠,使
三点重合,重合后的点记为
,构成一个三棱锥.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/47e81607-7355-45bb-abba-c2a73a42e7c5.png?resizew=324)
(1)请判断
与平面
的位置关系,并给出证明;
(2)证明:
平面
;
(3)求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/244ea6a312d4b6831a6b833ea3f4fcd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20cb2c77ea29b6eabbc477bc3743859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce768434bd7816df75a6f46b696c4d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c5ca03819aba64f49342f109462d886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f223740ec3b688a7a55c06ec8b57d85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/47e81607-7355-45bb-abba-c2a73a42e7c5.png?resizew=324)
(1)请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
(3)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb30211c56375a3901fc098174672e5f.png)
您最近一年使用:0次