如图,已知正四棱台
的侧棱与底面所成的角为
,O为下底面
的中心,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/2296ba12-dde3-4b95-b0dd-620aad55b2c0.png?resizew=285)
(1)证明:
平面
;
(2)求正四棱台
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d134433600df75f2a5d0f35deb2cac90.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/2296ba12-dde3-4b95-b0dd-620aad55b2c0.png?resizew=285)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de4723157b880c06d8c3d379149316b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c3590fe4de811edc0723205a081334.png)
(2)求正四棱台
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
21-22高一下·江西南昌·期末 查看更多[2]
更新时间:2022-07-02 10:45:06
|
相似题推荐
【推荐1】如图所示,四棱台
的上下底面均为正方形,侧面
与底面垂直,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/14/eb1e13c1-5824-42cf-a90d-5c80eb5acf3b.png?resizew=286)
(1)求证:平面
平面
;
(2)已知四棱台
的体积为
.给出以下两个问题:
①求异面直线BC和
的距离
②求
到平面
的距离.
请从以上两个问题中选取一道进行求解.
注:若两个问题均求解,则按第一个问题计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39eadc4035d90dcdbec8ddf9bf7d9873.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/14/eb1e13c1-5824-42cf-a90d-5c80eb5acf3b.png?resizew=286)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd14966183389b10618cbe33fd777407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)已知四棱台
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c8aa1b4e2be165a563859cc0b22b0.png)
①求异面直线BC和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b724168afaee2ecddf97257180be18.png)
请从以上两个问题中选取一道进行求解.
注:若两个问题均求解,则按第一个问题计分.
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解题方法
【推荐2】如图,在棱长为2的正方体
中,E是线段
的中点,平面
过点
、C、E.
截正方体所得的截面多边形的面积;
(2)平面
截正方体,把正方体分为两部分,求比较小的部分与比较大的部分的体积的比值.(参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42fe6c3be7c88262111f832504a9d74a.png)
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【推荐1】如图所示,在四棱柱
中,侧棱
底面
,
,且点M和N分别为
和
的中点.
![](https://img.xkw.com/dksih/QBM/2021/12/29/2883191441522688/2883491831332864/STEM/59defa70-18ce-49ad-91e3-d54b8f8ddf7d.png?resizew=256)
(1)求证:
∥平面
;
(2)求二面角
的正弦值;
(3)在棱
上是否存在点E,使得直线
和平面
所成角的正弦值为
?若存在试求出点E的位置,若没有请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94d393136ebd8166490cd4205ee60129.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9876917fc080fa8d81ba2592e34f3e66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e3334853138fb74687d66b1e45f2fd9.png)
![](https://img.xkw.com/dksih/QBM/2021/12/29/2883191441522688/2883491831332864/STEM/59defa70-18ce-49ad-91e3-d54b8f8ddf7d.png?resizew=256)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88595db9e3a4bf66275eae21fe0238e7.png)
(3)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d8e33929752b1cb4dd36ee9b98b45d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
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【推荐2】如图1所示,在等腰梯形
,
,
,垂足为
,
,
.将
沿
折起到
的位置,使平面
平面
,如图2所示,点
为棱
上一个动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/0abf0d9c-3c3e-4b71-821c-318e8f08d54f.png?resizew=397)
(Ⅰ)当点
为棱
中点时,求证:
平面
(Ⅱ)求证:
平面
;
(Ⅲ)是否存在点
,使得二面角
的余弦值为
?若存在,求出
的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5621d4d8a015b360c24a13fbd9fe409c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9df6a61c453b50f0fea4f4f640df45c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ebd4832e9d8d8aaa4cbd6c1ecbc6c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883a2f194f45a5d7360957359fae10c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa0a6b34b6323116c73675c052817575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9171484a68c84cad91e4f2233392f600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ddbf26eee57dc17b8813064c4e5d98e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e5215583d3938220292f0d634fea3b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/164e1cc74e41a2a55d3767c006392bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df8c72afea9fa5ab7f62401e15ca9743.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/0abf0d9c-3c3e-4b71-821c-318e8f08d54f.png?resizew=397)
(Ⅰ)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df8c72afea9fa5ab7f62401e15ca9743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdded1b115d2e7a170d6b38c9cbfb598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f9f7653ace3ff3839b072bac1b81165.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba1ff2afbc771a6708ca771f450b1997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73864d9d8a16b84a49e36438df4ce5e9.png)
(Ⅲ)是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acea36dde4b74a8b6bd18de4683ff709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fc860cece09bffcc2593dc7b11aee8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7ea03277f8408fabe5b327cc34838f.png)
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【推荐3】如图,在三棱柱
中,
面
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2021/11/27/2860523116462080/2870316853207040/STEM/dd2bebcb103e47a783f4ab5cfe2024ad.png?resizew=290)
(1)求证:
平面
;
(2)棱
上是否存在一点
,使得平面
平面
?若存在,求出
的长度;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0fc166a6287ed378b99177440e21424.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2021/11/27/2860523116462080/2870316853207040/STEM/dd2bebcb103e47a783f4ab5cfe2024ad.png?resizew=290)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/896e293411e2fd0da215ff20781cb36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba9e20d667d04bf3ee7f55cc795ce01.png)
(2)棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f4920aa344a6a1bf5ac5c6724f57d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba9e20d667d04bf3ee7f55cc795ce01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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【推荐1】如图,在四棱锥
中,
平面ABCD,底面ABCD是平行四边形,E、F为PD的两个三等分点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/9/5418a443-1ffe-4f58-a7ec-75ec5984f491.png?resizew=188)
(1)求证:
平面ACF;
(2)若平面
平面PCD,PC与平面ABCD所成角为
,
,
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/9/5418a443-1ffe-4f58-a7ec-75ec5984f491.png?resizew=188)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c372d059202ec388960b125d4a87dc84.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e867e5c7ef4da37d8985ce82022060e.png)
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解答题-证明题
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解题方法
【推荐2】如图,三棱柱
中,侧面
是菱形,其对角线的交点为O,且
,
C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/07191ad7-5b00-4fbb-984f-10dd2a028643.png?resizew=222)
求证:
平面
;
设
,若直线AB与平面
所成的角为
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92eebc380b5689d2dd2bc4a55d4aea3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18520f1b366c4fa6e8b137fc5019756c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/07191ad7-5b00-4fbb-984f-10dd2a028643.png?resizew=222)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce03b310edce42191f9fa75a1c909ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb5a97c6b563f00d0a71aef901eb7277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c8896fdc11b62ba3966acbf4f06375.png)
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