如图所示,在四棱锥
中,
平面
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5edfe97aeab0cf16b40fa9d2e15f9e.png)
,
,且
,
,
,
为
上一点.
(1)求证:
;
(2)若
为
的中点,求
与平面
所成角的正弦值.
![](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/1a5edfe97aeab0cf16b40fa9d2e15f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b5d2943803894bc5d204e75e2d172b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf7679c8b4b1e442ce4286d4b0e9c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/4/cbfbbb52-051f-48e1-84e4-efa859f35f98.png?resizew=170)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4611ceb2a28f7a7e4d24266d7f99b22.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
更新时间:2023-06-28 00:32:49
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【推荐1】如图所示的四棱锥E-ABCD中,底面ABCD为矩形,AE=EB=BC=2,AD⊥平面ABE,且CE上的点F满足BF⊥平面ACE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/cd7c2198-6a90-4648-b2e1-7426d9b877ff.png?resizew=178)
(1)求证:AE∥平面BFD;
(2)求三棱锥C-AEB的体积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/cd7c2198-6a90-4648-b2e1-7426d9b877ff.png?resizew=178)
(1)求证:AE∥平面BFD;
(2)求三棱锥C-AEB的体积.
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【推荐2】如图,圆柱的轴截面ABCD是正方形,点E在底面的圆周上,
,F是垂足.
(1)求证:AF
DB;
(2)求将
绕AD旋转一周所得几何体的表面积和圆柱表面积之比;
(3)如果圆柱与三棱锥
的体积比等于
,求直线DE与平面ABCD所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/876bb8ce0ca53475fa091ffd18bdc94a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/6c85cf53-86b0-49b3-ae11-3e7f265a4fdf.png?resizew=135)
(1)求证:AF
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
(2)求将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
(3)如果圆柱与三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2daa808ca8c95f282dae5e1d578cb65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b3ee8d998f8623dde79ac99cf727b3d.png)
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【推荐3】如图,四棱锥
中,底面
为平行四边形,
,
为等边三角形,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7b18f8e9fa326b3f960a0d8412bf289.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/3d71bc39-21ef-466e-b6b5-239cac4aac31.png?resizew=227)
(1)证明:
;
(2)求
与平面
所成角的正弦值.
![](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/cd7a42341edbc0b01ab0769c4c02c3e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7b18f8e9fa326b3f960a0d8412bf289.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/3d71bc39-21ef-466e-b6b5-239cac4aac31.png?resizew=227)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9104a1941e557a85fd1496bc2b9be297.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
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【推荐1】如图1,在多边形
中,四边形
为等腰梯形,
,
,
,四边形
为直角梯形,
,
.以
为折痕把等腰梯形
折起,使得平面
平面
,如图2所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/683ede86-dff3-4cb9-849e-331b1f0bb24e.png?resizew=344)
(1)证明:
平面
.
(2)求直线
与平面
所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1e04eeb4de72e5750dae77bcb6f88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f6a1c97f44a30cf2c78dfea184fe9d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e343510d82161bb1da2f17403f5d1b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15cd53fe7b73365723ce4789bb259d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597221bdc3fdacf0b653e447330df351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/683ede86-dff3-4cb9-849e-331b1f0bb24e.png?resizew=344)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
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【推荐2】如图所示,四棱锥S﹣ABCD中,四边形ABCD为平行四边形,BA⊥AC,SA⊥AD,SC⊥CD.
(Ⅰ)求证:AC⊥SB;
(Ⅱ)若AB=AC=SA=3,E为线段BC的中点,F为线段SB上靠近B的三等分点,求直线SC与平面AEF所成角的正弦值.
(Ⅰ)求证:AC⊥SB;
(Ⅱ)若AB=AC=SA=3,E为线段BC的中点,F为线段SB上靠近B的三等分点,求直线SC与平面AEF所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/0b11ca89-432b-41a5-be60-ef78eef71976.png?resizew=191)
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