如图,在四棱锥P-ABCD中,底面ABCD为菱形,∠BAD=60°,Q为AD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/0883b37e-9b24-4cd2-983c-63d7a1f000dd.png?resizew=183)
(1)若PA=PD,求证:平面PQB⊥平面PAD;
(2)点M在线段PC上,
,若平面PAD⊥平面ABCD,且PA=PD=AD=2,求二面角M-BQ-C的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/0883b37e-9b24-4cd2-983c-63d7a1f000dd.png?resizew=183)
(1)若PA=PD,求证:平面PQB⊥平面PAD;
(2)点M在线段PC上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc47768bee81ee0c6fbc41e3fdeb22cc.png)
21-22高二上·安徽滁州·期末 查看更多[8]
更新时间:2022-12-22 10:46:07
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相似题推荐
解答题-证明题
|
适中
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名校
【推荐1】如图,四棱锥
中,底面
为菱形,
平面
,点
是棱
的中点,点
是
的中点.
(Ⅰ)求证:直线
;(2)平面
平面
;
(Ⅱ)若底面
为正方形,
,求二面角
大小.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(Ⅰ)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb5133ad97793ac45d1a7911920d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15f3e3f310f6ec3f3a26498e7ee17a00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(Ⅱ)若底面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74107ed86d62c4a2ca1630d626dff115.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/206695fadf6ab817ae8650f47fbf65d3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/13dd10f8-237e-4bba-987d-95cbcd53c9d9.png?resizew=169)
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解题方法
【推荐2】在四棱锥
中,
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/3/30/2689178753163264/2693954507538432/STEM/e45d54fac12147908deb437e1d98a6c1.png?resizew=142)
(1)证明:平面
平面PAC;
(2)若F是PC的中点,求证:
平面PAD.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef7252c9e3a1aebe1b31d080ac7ea725.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b802b67ff805001ac88a6c85a795c07.png)
![](https://img.xkw.com/dksih/QBM/2021/3/30/2689178753163264/2693954507538432/STEM/e45d54fac12147908deb437e1d98a6c1.png?resizew=142)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04c222223dae9ef27d4c132534d9848.png)
(2)若F是PC的中点,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d32e76582bf550593fdef53e081225.png)
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【推荐1】在四棱锥
中,侧面
底面ABCD,底面ABCD为直角梯形,
,
,
,
,E,F分别为AD,PC的中点.
![](https://img.xkw.com/dksih/QBM/2019/2/17/2142824740323328/2144979324903424/STEM/b3e8f545ccda4f2eb0d15c55b0ac5ab9.png?resizew=187)
Ⅰ
求证:
平面BEF;
Ⅱ
若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebbb79892c8cb8871a08437acc09bc80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c58bafdd3bb54ba3491b49ab60b172f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb655dcddebb50942249461aa852fba9.png)
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![](https://img.xkw.com/dksih/QBM/2019/2/17/2142824740323328/2144979324903424/STEM/b3e8f545ccda4f2eb0d15c55b0ac5ab9.png?resizew=187)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1666b45ed176d648dd1764f4a2dbd73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ca211f5091244d59a9380111f2e5ca3.png)
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【推荐2】已知四棱柱
中,底面
为菱形,
,
为
中点,
在平面
上的投影
为直线
与
的交点.
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe6be7370058c9b0b4dd6fe7d999dfa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d98c843d3cc814335f8d4796bf131d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df6b00aa8eb26bee3d039144c2c8cfaf.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b7330a47ee62725071b8df19e0f748c.png)
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解答题-作图题
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【推荐3】已知正方体
,棱长为2.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/22/a62d61f5-fab8-4349-b9df-25ba561d1ddd.png?resizew=171)
(1)求证:
平面
;
(2)若平面
平面
,且平面
与正方体的棱相交,当截面面积最大时,在所给图形上画出截面图形(不必说出画法和理由),并求出截面面积的最大值;
(3)在(2)的情形下,设平面
与正方体的棱
、
、
交于点
、
、
,当截面的面积最大时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/22/a62d61f5-fab8-4349-b9df-25ba561d1ddd.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26d8a9d64ad3c8cba28840b41ed7837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae7f4612c548b1f72a964ddb291cd2e.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/414844edd458857bdfc80bffa61cbf9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae7f4612c548b1f72a964ddb291cd2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(3)在(2)的情形下,设平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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