如图,在三棱锥ABCD中,且AD⊥DC,AC⊥CB,面ABD⊥面BCD,AD=CD=BC,E为AC的中点,H为BD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/07da23e7-2ba9-452d-85f2-d3081ac0f3d4.png?resizew=170)
(1)求证:AD⊥BC;
(2)在直线CH上确定一点F,使得AF∥面BDE,求AF与面BCD所成角的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/07da23e7-2ba9-452d-85f2-d3081ac0f3d4.png?resizew=170)
(1)求证:AD⊥BC;
(2)在直线CH上确定一点F,使得AF∥面BDE,求AF与面BCD所成角的度数.
2022高二下·浙江绍兴·学业考试 查看更多[3]
浙江省绍兴市诸暨市2021-2022学年高二下学期学考模拟(4)数学试题(已下线)7.4 几何法求空间角(精练)(已下线)8.6.2直线与平面垂直的性质定理(第2课时)(精讲)(1)-【精讲精练】2022-2023学年高一数学下学期同步精讲精练(人教A版2019必修第二册)
更新时间:2022-08-05 12:28:53
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【推荐1】如图所示,四棱锥
的底面
是矩形,
,
,
,点
为
的中点,
与
交于点
.
(1)求证:平面
平面
;
(2)求直线
与平面
所成角的正切值.
![](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/a49f6992e79c285b9f82e49a74d2fc5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1ac2e11788860424508ea9e80cf89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/540951846d8622c3eb858a326f5e23de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2021/6/16/2744240416759808/2751257616916480/STEM/b11e456cafcd4d55b77e18442315ce9a.png?resizew=264)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c26f7a112f96b85deceae436a21388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】过四棱柱
的顶点A作截面AEFG,其中底面ABCD是菱形,∠BCD=60°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/fc8b3b42-173d-4318-b738-a30cea1e0bc0.png?resizew=210)
(1)证明:截面AEFG是平行四边形;
(2)已知
ADG是正三角形,平面ADG⊥平面ABCD,且AB=2,CF=3,求直线DF与平面BCFE所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/fc8b3b42-173d-4318-b738-a30cea1e0bc0.png?resizew=210)
(1)证明:截面AEFG是平行四边形;
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
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【推荐1】如图,在正三棱柱
中,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/c52e064b-a853-4880-bd60-f694520b0464.png?resizew=148)
(1)证明:
;
(2)求平面
与平面
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92105835f8075cb75dff244e908370b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/c52e064b-a853-4880-bd60-f694520b0464.png?resizew=148)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b0bfe1e7a956345f7ed58a3b2faa70.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
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解题方法
【推荐2】如图,在直三棱柱
中,
,
,
为
中点,
与
交于点
.
(1)求证:
∥平面
.
(2)求证:
平面
.
(3)在线段
上是否存在点
,使得
?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd8f940b796af67206b3f9dd410a407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5888bec948373f3854258ad80171073d.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e16f65c3a318220c2f5baac171bbb61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a211ad5a06b505b8365a62c1946f3cb7.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff24d05b5b9502c2be337f9be84fe4ed.png)
![](https://img.xkw.com/dksih/QBM/2017/11/3/1809219827998720/1809781657174016/STEM/f692824c8777477c8bc92199c93a385e.png?resizew=181)
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【推荐3】如图,
平面ABCD,四边形ABCD是正方形,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/8/3c66657b-ce06-4bb3-9774-84ae96f0ca75.png?resizew=168)
(1)证明:AB垂直平面PDE;
(2)求直线
与平面DCE所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8429790ba9382464cf29244da6f1c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e975fa87eb6a9c2fe19a943cefee808.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/8/3c66657b-ce06-4bb3-9774-84ae96f0ca75.png?resizew=168)
(1)证明:AB垂直平面PDE;
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
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