如图,四棱锥
的底面
是平行四边形,
底面
,
,
,平行四边形
的面积为
,设
是侧棱
上一动点.
![](https://img.xkw.com/dksih/QBM/2022/2/12/2915036630048768/2919319560306688/STEM/31fd526597c44e8b94b36a6620742152.png?resizew=222)
(1)求证:
;
(2)当
是棱
的中点时,求点
到平面
的距离.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c2753753faf2cb9a0003aa8e3945159.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.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/2022/2/12/2915036630048768/2919319560306688/STEM/31fd526597c44e8b94b36a6620742152.png?resizew=222)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dac702fe64edf1bc265da4b98cf2a0.png)
(2)当
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
更新时间:2022-02-18 23:13:45
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,已知点
在圆柱
的底面圆
上,
,圆
的直径
,圆柱的高
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/a2e864f7-0f27-4b68-9182-557d6bbfc8d9.png?resizew=158)
(1)求圆柱的表面积;
(2)求点
到平面
的距离;
(3)求直线
与
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192f4f9446c954a291f779d963f90257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dfffb77e9656a22d5951d9f1c6a7c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/207fdd4b8487a5c6fdfcf1e677732385.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/a2e864f7-0f27-4b68-9182-557d6bbfc8d9.png?resizew=158)
(1)求圆柱的表面积;
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f19904e64008030ae31ea15a1aa4d74.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0ff310aabd2282b539537ebed3f788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】在平面四边形
(图①)中,
与
均为直角三角形且有公共斜边
,设
,
,
,将
沿
折起,构成如图②所示的三棱锥
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/ffc4a01a-d97a-46e4-a542-aec7976e49c6.png?resizew=279)
(1)当
时,求证:平面
平面
;
(2)当
时,求三棱锥
的高.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56e703b755cc4fe7ec89af69ec7c93d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73152c2b4298298c8b81dc16dc21f5e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b32ae75c9beabff560f1b52a52d434.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/ffc4a01a-d97a-46e4-a542-aec7976e49c6.png?resizew=279)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2729bf6328f5e780b9a4833a22145bed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de9c453fedddec0d181f486fb00b185e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ddc76d96d6951ebfef3fe63892a1114.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/555dfe77eeb168a880694e22bd9acbdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b32ae75c9beabff560f1b52a52d434.png)
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(0.65)
【推荐1】如图,在四棱锥
中,
平面
,四边形
是菱形,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/16/28b74318-6816-463e-8593-6649e45f1eae.png?resizew=151)
(1)求证:
;
(2)已知二面角
的余弦值为
,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/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060116c80c382b8570f52803ce5fee76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/16/28b74318-6816-463e-8593-6649e45f1eae.png?resizew=151)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b757706eee506a078fc25e3f33a70cb.png)
(2)已知二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c5651e38293e0c42a7278af69fa53ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83303d3784492506fc44f2b4d6b07bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
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【推荐2】如图所示,在四棱锥E-ABCD中,平面ABCD⊥平面AEB,且四边形ABCD为矩形.∠BAE=90°,AE=4,AD=2,F,G,H分别为BE,AE,AD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/ad28322d-50a6-4fbb-862e-4742ceb2feb7.png?resizew=174)
(Ⅰ)求证:CD∥平面FGH;
(Ⅱ)求证:平面FGH⊥平面ADE;
(Ⅲ)在线段DE求一点P,使得AP⊥FH,并求出AP的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/ad28322d-50a6-4fbb-862e-4742ceb2feb7.png?resizew=174)
(Ⅰ)求证:CD∥平面FGH;
(Ⅱ)求证:平面FGH⊥平面ADE;
(Ⅲ)在线段DE求一点P,使得AP⊥FH,并求出AP的值.
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【推荐3】如图,在四棱锥
中,
.
![](https://img.xkw.com/dksih/QBM/2021/12/9/2868710779445248/2868937883131904/STEM/5036e9baac5149339120b1a6932fad3e.png?resizew=170)
(1)证明:
;
(2)求直线
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/8e401bafda83fe0b39cac13bf36d4533.png)
![](https://img.xkw.com/dksih/QBM/2021/12/9/2868710779445248/2868937883131904/STEM/5036e9baac5149339120b1a6932fad3e.png?resizew=170)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5ea309886e947ea7cb4b81716206fd.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
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