如图1,在三棱锥P-ABC中,PA⊥平面ABC,AC⊥BC,D为侧棱PC上一点,它的正(主)视图和侧(左)视图如图2所示.
![](https://img.xkw.com/dksih/QBM/2012/8/28/1570985983533056/1570985989070848/STEM/4fe8d96c50f3424c8a82fd6a56bdc77e.png)
(1) 证明:AD⊥平面PBC;
(2) 在∠ACB的平分线上确定一点Q,使得PQ∥平面ABD,并求此时PQ的长.
![](https://img.xkw.com/dksih/QBM/2012/8/28/1570985983533056/1570985989070848/STEM/4fe8d96c50f3424c8a82fd6a56bdc77e.png)
(1) 证明:AD⊥平面PBC;
(2) 在∠ACB的平分线上确定一点Q,使得PQ∥平面ABD,并求此时PQ的长.
13-14高三上·广东中山·阶段练习 查看更多[2]
更新时间:2016-12-02 15:58:55
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【推荐1】如图,在斜三棱柱
中,点
、
分别是
、
的中点,
平面
.已知
,
.
(Ⅰ)证明:
平面
;
(Ⅱ)求异面直线
与
所成的角;
(Ⅲ)求
与平面
所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/2012/5/17/1570857997066240/1570858002644992/STEM/91ffa8d8593e4287921f830254edcace.png)
![](https://img.xkw.com/dksih/QBM/2012/5/17/1570857997066240/1570858002644992/STEM/4f4e3f8324734bc48f14f800248e3340.png)
![](https://img.xkw.com/dksih/QBM/2012/5/17/1570857997066240/1570858002644992/STEM/4d3134e3d2af4a508a1238d59643f92c.png)
![](https://img.xkw.com/dksih/QBM/2012/5/17/1570857997066240/1570858002644992/STEM/7ec613da115c4de2bc173c6212f9cc9e.png)
![](https://img.xkw.com/dksih/QBM/2012/5/17/1570857997066240/1570858002644992/STEM/6c237290e46e4465980240250f157482.png)
![](https://img.xkw.com/dksih/QBM/2012/5/17/1570857997066240/1570858002644992/STEM/83e194d0c04147a0b55a7b1eabceca0e.png)
![](https://img.xkw.com/dksih/QBM/2012/5/17/1570857997066240/1570858002644992/STEM/2fedb5418ea044adb6f840439cdd0cee.png)
![](https://img.xkw.com/dksih/QBM/2012/5/17/1570857997066240/1570858002644992/STEM/4e08a720d1bd42ebaf1fa9e030fac067.png)
![](https://img.xkw.com/dksih/QBM/2012/5/17/1570857997066240/1570858002644992/STEM/864fe98b347d4ef798f77c46d082c46b.png)
(Ⅰ)证明:
![](https://img.xkw.com/dksih/QBM/2012/5/17/1570857997066240/1570858002644992/STEM/be508542a0ed4a47b308c7d3817e6d1c.png)
![](https://img.xkw.com/dksih/QBM/2012/5/17/1570857997066240/1570858002644992/STEM/8b572b7dc87d47aa90e5cab13e78cecf.png)
(Ⅱ)求异面直线
![](https://img.xkw.com/dksih/QBM/2012/5/17/1570857997066240/1570858002644992/STEM/a3a38c3610dc4bcd952d85820315d193.png)
![](https://img.xkw.com/dksih/QBM/2012/5/17/1570857997066240/1570858002644992/STEM/f0dfb3586a38464bb9a47901d98a7286.png)
(Ⅲ)求
![](https://img.xkw.com/dksih/QBM/2012/5/17/1570857997066240/1570858002644992/STEM/7ec613da115c4de2bc173c6212f9cc9e.png)
![](https://img.xkw.com/dksih/QBM/2012/5/17/1570857997066240/1570858002644992/STEM/3da1a3882d214ec8a028bd44f466ad34.png)
![](https://img.xkw.com/dksih/QBM/2012/5/17/1570857997066240/1570858002644992/STEM/38506a19cae3487bac38489e1502e4e9.png)
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解题方法
【推荐2】如图,四棱锥
的底面是矩形,
底面
,
,
分别为
,
的中点,
与
交于点
,
,
,
为
上一点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/92de9309-06ce-48d2-b5f9-93c8e17fbbeb.png?resizew=161)
(1)证明:
,
,
,
四点共面;
(2)求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76a935359a3c5113c218edd0d0ce5dcb.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/ac047e91852b91af639feec23a9598b2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a26427f7523d2a63e760b83340d3dcb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/92de9309-06ce-48d2-b5f9-93c8e17fbbeb.png?resizew=161)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ee7e6c0b8caf5c276776d3e968e851f.png)
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【推荐1】如图,已知直三棱柱
中,
,
为
中点,
,再从条件①,条件②这两个条件中选择一个作为已知,完成以下问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/d75d8ac9-de11-4f4f-af96-5a08d9b13f33.png?resizew=125)
(1)证明:
;
(2)求直线
与平面
所成角的正弦值.
条件①:
;
条件②:
.
注:如果选择条件①和条件②分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3e9ef3e849788645552cfb0735d987.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/d75d8ac9-de11-4f4f-af96-5a08d9b13f33.png?resizew=125)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fa8345302e8036af33d4598282144d7.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14b8f65872fbe939603c6e2acee74baa.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9959790095c938b094ddf5953d2b7d2b.png)
条件②:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1ac2e11788860424508ea9e80cf89d.png)
注:如果选择条件①和条件②分别解答,按第一个解答计分.
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【推荐2】如图,在四棱锥P−ABCD中,PD⊥底面ABCD,底面ABCD为平行四边形,∠ADB=90°,AB=2AD.
![](https://img.xkw.com/dksih/QBM/2015/7/16/1572184568242176/1572184574042112/STEM/bc7f9e4fea114847b685a15b46c3c819.png)
(Ⅰ)求证:平面PAD⊥平面PBD;
(Ⅱ)若PD=AD=1,
,求二面角P−AD−E的余弦值.
![](https://img.xkw.com/dksih/QBM/2015/7/16/1572184568242176/1572184574042112/STEM/bc7f9e4fea114847b685a15b46c3c819.png)
(Ⅰ)求证:平面PAD⊥平面PBD;
(Ⅱ)若PD=AD=1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a90dd9d52015a5987e4830c7ea981.png)
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【推荐3】如图,等腰梯形ABCD中,AB∥CD,AD=AB=BC=1,CD=2,E为CD中点,以AE为折痕把△ADE折起,使点D到达点P的位置(P∉平面ABCE).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/0ee48d4b-53dd-41be-814f-4b9d28a8cb23.png?resizew=424)
(1)证明:AE⊥PB;
(2)若直线PB与平面ABCE所成的角为
,求二面角A﹣PE﹣C的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/0ee48d4b-53dd-41be-814f-4b9d28a8cb23.png?resizew=424)
(1)证明:AE⊥PB;
(2)若直线PB与平面ABCE所成的角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
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