直三棱柱
中,点M、N分别为BC、
中点.
(1)求证:
平面
;
(2)已知
,
,
.
(i)求直线
与平面
所成角的大小;
(ii)求点C到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/c4dabed4-2a37-49ef-a540-1fc781d9bf95.png?resizew=149)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b7b7793d29d66dfdd89e7a6564a35c.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df209c58c4cc146ef62100e6d3b068d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
(i)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
(ii)求点C到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
更新时间:2023-11-26 16:01:54
|
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解答题-问答题
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解题方法
【推荐2】如图,在正方体
中,点M,N分别是
,
的中点,求直线CM与
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a696a182fff038a86b2bbe8ca099442.png)
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【推荐1】如图,在正方体
中
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/4ebee195-d10d-4dc7-b3fc-25b5dfa00555.png?resizew=171)
(1)求证:
平面
;
(2)求异面直线
与
所成的角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/4ebee195-d10d-4dc7-b3fc-25b5dfa00555.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/debdc6632a4877e5131d3da25cda8b89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e86eec8526479272d15bb3b171a46de0.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588eb9393564a33552c4b2e8de837ca5.png)
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【推荐2】如图,在三棱锥P-ABC中,∠PAC=90°,AB=BC,E,F分别为AC,PC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/2cb6a69f-8d49-4b89-86e5-46e89f3016e6.png?resizew=156)
(1)求证:
平面
;
(2)求证:AC⊥BF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/2cb6a69f-8d49-4b89-86e5-46e89f3016e6.png?resizew=156)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373f735f0f04d11f1951eaef1bb78b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
(2)求证:AC⊥BF.
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【推荐1】如图,四棱锥P﹣ABCD中,底面ABCD为直角梯形,AD∥BC,AB⊥AD,PA⊥平面ABCD,AD=5,BC=2AB=4,M为PC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/bdd086cf-9977-4ece-a13f-6d0d8573ef93.png?resizew=185)
(1)求证:平面PAC⊥平面PCD;
(2)若AM⊥PC,求直线PB与面PCD所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/bdd086cf-9977-4ece-a13f-6d0d8573ef93.png?resizew=185)
(1)求证:平面PAC⊥平面PCD;
(2)若AM⊥PC,求直线PB与面PCD所成角的正弦值.
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【推荐2】如图,在直三棱柱
中,底面
为等边三角形.点
为
的中点,
.
![](https://img.xkw.com/dksih/QBM/2021/5/10/2718227208626176/2719575137132544/STEM/66a8c499981848cc8da8e94ade2c1b45.png?resizew=193)
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值;
(3)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e5a6afab22d5b53c1d8e87d58e8020.png)
![](https://img.xkw.com/dksih/QBM/2021/5/10/2718227208626176/2719575137132544/STEM/66a8c499981848cc8da8e94ade2c1b45.png?resizew=193)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231673dd67ab79d3c5da73904ceade1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62fd0b510920be6bc60d170c3ff3da3.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a7bcc1efb8a2ff57d64b6d057da463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b261a80e547428e5279cf0c2ee616f8.png)
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【推荐1】如图,在直三棱柱ABC﹣A1B1C1中,BA⊥BC,BA=BC=BB1=2.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712444708528128/2718985807454208/STEM/ebe168fb-1cc0-4512-8831-44f429c423ce.png?resizew=267)
(1)求异面直线AB1与A1C1所成角的大小;
(2)若M是棱BC的中点.求点M到平面A1B1C的距离.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712444708528128/2718985807454208/STEM/ebe168fb-1cc0-4512-8831-44f429c423ce.png?resizew=267)
(1)求异面直线AB1与A1C1所成角的大小;
(2)若M是棱BC的中点.求点M到平面A1B1C的距离.
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【推荐2】在棱长为1正方体中
,已知O为
中点,以D为原点,
所在直线分别为
轴,建立如图所示的空间直角坐标系
.
![](https://img.xkw.com/dksih/QBM/2021/10/26/2837711628607488/2841308693684224/STEM/fc1b3196-eb17-4555-ba1f-6114cc59c01f.png?resizew=227)
(1)求平面
的法向量
,并证明
平面
;
(2)求
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e1dd635cae84319a62ed68af58901b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a14c388e1e2e5a2ff1ccf6caffbee0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c76ee17afa983fa795545b5568b80089.png)
![](https://img.xkw.com/dksih/QBM/2021/10/26/2837711628607488/2841308693684224/STEM/fc1b3196-eb17-4555-ba1f-6114cc59c01f.png?resizew=227)
(1)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276210a2e9d4e3fdd7352c29cbb65359.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f1a8e551cba7ec9f451749f60e628d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504a36c231b8e80724d01649e7c0944f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276210a2e9d4e3fdd7352c29cbb65359.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276210a2e9d4e3fdd7352c29cbb65359.png)
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