如图,在四棱锥
中,底面
为平行四边形,且
.
![](https://img.xkw.com/dksih/QBM/2020/3/9/2415644933455872/2416095534546944/STEM/4672876859ca44b08ccfa8399ef113f1.png?resizew=177)
(1)证明:平面
平面
;
(2)若
,且四棱锥的侧面积为
,求该四棱锥
的体积.
![](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/63d0c2a55d368a0447e0ca8c2a296c28.png)
![](https://img.xkw.com/dksih/QBM/2020/3/9/2415644933455872/2416095534546944/STEM/4672876859ca44b08ccfa8399ef113f1.png?resizew=177)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfdd34a7a97dc37cc9889b467e1dedac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc6fc9d4be192bf91fae0bea46a624a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
更新时间:2020-03-09 23:41:51
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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
解题方法
【推荐1】如图,在四棱锥
中,底面
是直角梯形,
垂直于
和
,侧棱
底面
,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/009fe704-d3a7-49c0-ac59-7261af4c15e1.png?resizew=138)
(1)求三棱锥
的体积;
(2)求直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87d11dd7422f4703763abc23d83c7584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/009fe704-d3a7-49c0-ac59-7261af4c15e1.png?resizew=138)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69dd9f16a5c7a66e62e52fd66f4449ee.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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解答题-问答题
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适中
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【推荐2】已知
是底面边长1的正四棱柱,
为
与
的交点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/387a5d41-4c7c-4b1a-a364-9d24b2657f7e.png?resizew=174)
(1)设
与底面
所成的角为
,求该棱柱的侧面积;
(2)若点
到平面
的距离为
,求四棱柱
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/387a5d41-4c7c-4b1a-a364-9d24b2657f7e.png?resizew=174)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/717d026dd0029aab76fd410d88f67bd8.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae7f4612c548b1f72a964ddb291cd2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图1,已知菱形AECD的对角线AC,DE交于点F,点E为AB的中点.将三角形ADE沿线段DE折起到PDE的位置,如图2所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/75355912-2ce9-419b-a0fd-5b867b920c65.png?resizew=409)
(1)求证:
;
(2)试问平面PFC与平面PBC所成的二面角是否为
,如果是,请证明;如果不是,请说明理由;
(3)在线段PD,BC上是否分别存在点M,N,使得平面
平面PEN?若存在,请指出点M,N的位置,并证明;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/75355912-2ce9-419b-a0fd-5b867b920c65.png?resizew=409)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3672e603d06c9186edd20cfc662d8dc.png)
(2)试问平面PFC与平面PBC所成的二面角是否为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
(3)在线段PD,BC上是否分别存在点M,N,使得平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3fe10db2e675faefe668d357ceb0633.png)
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【推荐2】将正方形
绕直线
逆时针旋转
,使得
到
的位置,得到如图所示的几何体.
平面
;
(2)点
为
上一点,若二面角
的余弦值为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6380f35cdd3050759a4a91b8637adc1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42ce82a4c37365f2d4dea2c4ad2e3288.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbdb53e0fdf3ebeb96e4f69feacbd80e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a903891e53a9b7768e1c5ae7126f7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94d2506539ad8760cf7ed366c0c537c.png)
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