如图,在四棱锥
中,
底面ABCD,底面ABCD是等腰梯形,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8d5b5593b43b79ac72407c8d3d8587.png)
,
.
![](https://img.xkw.com/dksih/QBM/2021/12/14/2872246081134592/2912731688001536/STEM/1d29201cda4041c899cf0a923aeff4f5.png?resizew=262)
(1)证明:
;
(2)求点C到平面PBD的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8d5b5593b43b79ac72407c8d3d8587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff0e3b3fa66ee83202bf4706a2deb7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23190378f340ce5e8306f88c3caef1dc.png)
![](https://img.xkw.com/dksih/QBM/2021/12/14/2872246081134592/2912731688001536/STEM/1d29201cda4041c899cf0a923aeff4f5.png?resizew=262)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5d56d8170b764b80a672cd6c861921.png)
(2)求点C到平面PBD的距离.
更新时间:2022-02-09 15:50:42
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相似题推荐
解答题-问答题
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适中
(0.65)
名校
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【推荐1】正三棱柱
中,
是棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/264ab817-bc7f-4ce8-b36d-769e2a70f350.png?resizew=146)
(Ⅰ)求证:
平面
;
(Ⅱ)设
,
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/264ab817-bc7f-4ce8-b36d-769e2a70f350.png?resizew=146)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1496afecd92a619fbe5e9b736f06f4e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2a0a3bb566b5d2404e4bb823abddfa9.png)
(Ⅱ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6db57eca2a7cbd91bc57372592580a76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2a0a3bb566b5d2404e4bb823abddfa9.png)
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解答题-问答题
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【推荐2】已知圆柱OO1底面半径为1,高为π,ABCD是圆柱的一个轴截面.动点M从点B出发沿着圆柱的侧面到达点D,其距离最短时在侧面留下的曲线Γ如图所示.将轴截面ABCD绕着轴OO1逆时针旋转θ(0<θ<π)后,边B1C1与曲线Γ相交于点P.
![](https://img.xkw.com/dksih/QBM/2020/5/13/2461653646761984/2462564952023040/STEM/dee7805fb2e94d7fb256b095dc62f9ba.png?resizew=227)
(1)求曲线Γ长度;
(2)当
时,求点C1到平面APB的距离;
(3)是否存在θ,使得二面角D﹣AB﹣P的大小为
?若存在,求出线段BP的长度;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/5/13/2461653646761984/2462564952023040/STEM/dee7805fb2e94d7fb256b095dc62f9ba.png?resizew=227)
(1)求曲线Γ长度;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a0f96c4dfd44a0412601f183a8c7443.png)
(3)是否存在θ,使得二面角D﹣AB﹣P的大小为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
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【推荐1】如图所示的几何体
中,
平面
,
,
,
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/eabcbc25-534b-48b4-b152-a50305ea47b9.png?resizew=203)
(1)求证:
;
(2)若
.
①求直线
与平面
所成角的正弦值;
②二面角
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be89b9d1709d7974a108142c5fa2ccec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7bd02e0adeae92ba9526261b1baf797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a277db452e76240ec83ec6a2864bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52bbb16f9380dd62d556480a3944be31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66418ef39d3081d89411a4907d8599f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdf241efcd0c8026d188fad5a5ba4e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/eabcbc25-534b-48b4-b152-a50305ea47b9.png?resizew=203)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f5ffe436f8eb53a211abf95baed8ca9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b1a3078dc4803bd5e16833ddd459e0.png)
①求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
②二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7874b5f6364f474023a57e5fe08bc90.png)
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解答题-证明题
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适中
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【推荐2】如图,在四棱锥
中,四边形
是正方形,
,
平面
,点
是棱
的中点,点
是棱
上的一点,且
.
(1)求证:
平面
;
(2)求点
到平面
的距离.
![](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/b624742fe28db114e0554c6c87bff05c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4a6a1e70241d600bc6c104313eac61.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/19/6791e1f7-cf07-4b7c-a135-15fa46568003.png?resizew=181)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373f735f0f04d11f1951eaef1bb78b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466fabcaac59132fea648ff35342ec9d.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466fabcaac59132fea648ff35342ec9d.png)
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