解题方法
1 . 如图,在三棱锥
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/616f283e9a775bd15533176e6a567326.png)
.
![](https://img.xkw.com/dksih/QBM/2022/8/5/3038079035293696/3038737826725888/STEM/98e5dd862f7542e6aee7bd726a31c8d3.png?resizew=118)
(1)证明:平面
平面
;
(2)求二面角
的平面角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/616f283e9a775bd15533176e6a567326.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f17ef2f38ffd644351cfeaae5ccbfd4.png)
![](https://img.xkw.com/dksih/QBM/2022/8/5/3038079035293696/3038737826725888/STEM/98e5dd862f7542e6aee7bd726a31c8d3.png?resizew=118)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b6e6192cf24ada791c26c2d6d434069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae8f249c2bec5e988d4b1d233c80c5b4.png)
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解题方法
2 . 如图,在三棱锥
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df8ae465bd880e7e2eda6fb28b2167d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3ec77c14f1aa7a28430832538597c4.png)
![](https://img.xkw.com/dksih/QBM/2022/8/5/3038039804092416/3038722660859904/STEM/47aaa34e44b740b0bf54b5ed1cf2cf30.png?resizew=171)
(1)求证:
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df8ae465bd880e7e2eda6fb28b2167d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3ec77c14f1aa7a28430832538597c4.png)
![](https://img.xkw.com/dksih/QBM/2022/8/5/3038039804092416/3038722660859904/STEM/47aaa34e44b740b0bf54b5ed1cf2cf30.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e4b16c2c6c9bd089da78122e9d2511.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e820aec9c1a975242fe6d76408a9cde8.png)
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解题方法
3 . 设正六面体
的棱长为2,下列命题正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
A.![]() |
B.二面角![]() ![]() |
C.若![]() ![]() |
D.设![]() ![]() ![]() ![]() |
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4 . 如图,四棱锥P−ABCD的底面ABCD是边长为2的正方形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/6fe13a00-c920-4d90-b1a3-0012c255ab33.png?resizew=171)
(1)证明:PC=PD;
(2)当直线PA与平面PCD所成角的正弦值最大时,求此时二面角P−AB−C的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f01178cfd892d82642d9e055812f3e2a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/6fe13a00-c920-4d90-b1a3-0012c255ab33.png?resizew=171)
(1)证明:PC=PD;
(2)当直线PA与平面PCD所成角的正弦值最大时,求此时二面角P−AB−C的大小.
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5 . 在三棱锥P−ABC中,AB=BC,BC⊥平面PAB,平面PAC⊥平面ABC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/28/832db05e-64c8-439f-a97b-63a7229a16cc.png?resizew=149)
(1)证明:PA⊥平面ABC;
(2)若D为PC的中点,且
,求平面DAB与平面ABC所成二面角的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/28/832db05e-64c8-439f-a97b-63a7229a16cc.png?resizew=149)
(1)证明:PA⊥平面ABC;
(2)若D为PC的中点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d827c3694aaa02490e0a9c01b45ddc5.png)
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6 . 如图,在四棱锥P-ABCD中,底面ABCD为菱形,∠DAB=60°,AB=2,PB=
,侧面PAD为正三角形,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/7/11/3020153114959872/3022673562329088/STEM/1a3c12bdab5247bda5b36808a50a108c.png?resizew=173)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://img.xkw.com/dksih/QBM/2022/7/11/3020153114959872/3022673562329088/STEM/1a3c12bdab5247bda5b36808a50a108c.png?resizew=173)
A.平面PAD⊥平面ABCD | B.异面直线AD与PB所成的角为60° |
C.二面角P-BC-A的大小为45° | D.三棱锥P-ABD外接球的表面积为![]() |
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7 . 斜三棱柱
的体积为4,侧面
侧面
,
的面积为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2031d209711b058f3d278ede3c1d33.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/9a15d76f-0386-47ec-895e-9749c2c3ac84.png?resizew=160)
(1)求点
到平面
的距离;
(2)如图,
为
的中点,
,
,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a2e10a5aebe40a9018d5ee3ade7af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6941ec0543ccc9140b347ebfe8d45d2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2031d209711b058f3d278ede3c1d33.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/9a15d76f-0386-47ec-895e-9749c2c3ac84.png?resizew=160)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(2)如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea5a7487a18a0c3df513f58510ac0e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9ee82d7cddd015d0715152994bb29f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966b2d5659b3dc130fe0e4b2c0ff0072.png)
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8 . 如图,在三棱锥
中,
,
,
两两互相垂直,
,
分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/8a034a64-fdd7-4f98-88a6-279030b9dc3a.png?resizew=245)
(1)证明:
;
(2)设
,
,
和平面
所成角的大小为
,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/8a034a64-fdd7-4f98-88a6-279030b9dc3a.png?resizew=245)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf271d6475f5305bc922677b4cfe28c.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a65b94de267eb6858634181642c65c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3427311203b1958b9ff89084c66a09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca6d1c5eace748465b2dad5065f5111c.png)
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9 . 如图,在直三棱柱
中,
,P为线段
上的动点,则下列结论中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/1d60154e-cbcb-42ea-a5e5-62463d948406.png?resizew=140)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ae83293789fe7367bf45b0dda77dbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/1d60154e-cbcb-42ea-a5e5-62463d948406.png?resizew=140)
A.点A到平面![]() ![]() |
B.平面![]() ![]() |
C.三棱柱![]() ![]() |
D.二面角![]() ![]() |
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解题方法
10 . 如图所示,已知在四棱锥
中,底面ABCD是边长为2的菱形,
,侧棱
,
,过点A的平面与侧棱PB,PD,PC相交于点E,F,M,且满足:
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/9/f0c96c99-b051-4bbe-acd2-bb228824de82.png?resizew=226)
(1)求证:直线
平面PAD;
(2)求证:直线
平面AEMF;
(3)求平面MDB与平面AEMF所成二面角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983ec5b9fd5d080e6e505d36edbfd300.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32d0710321d97361e5782124bbf7f0c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b30155e0e3cf7c5146d3311e5b8da93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dca0fddd44a2a325754baf9452fe90a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/9/f0c96c99-b051-4bbe-acd2-bb228824de82.png?resizew=226)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963a91995abd4927d75406d16e10a81f.png)
(2)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
(3)求平面MDB与平面AEMF所成二面角的正弦值.
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