如图所示,某地出土的一种“钉”是由四条线段组成,其结构能使它任意抛至水平面后,总有一端所在的直线竖直向上,并记组成该“钉”的四条线段的公共点为
,钉尖为
,设
.
![](https://img.xkw.com/dksih/QBM/2021/12/24/2879338785325056/2881450229211136/STEM/dc8dc1abbf5940938b23dd2532dd3e36.png?resizew=288)
(1)当
在同一水平面内时,求
与平面
所成角的大小(结果用反三角函数值表示);
(2)若该“钉”着地后的四个线段根据需要可以调节与底面成角的大小,且保持三个线段与底面所成角相同,若
,用
的代数式表示
的体积;
(3)在(2)的条件下,如果
的体积是
体积的
,求
的值(结果用反三角函数值表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d15817fdf6ad63e45ae3f52ea611d163.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee5747ae1c372be1170242c4aecee5e.png)
![](https://img.xkw.com/dksih/QBM/2021/12/24/2879338785325056/2881450229211136/STEM/dc8dc1abbf5940938b23dd2532dd3e36.png?resizew=288)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c53330131c588fce38bb4cc44a5c927.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4195334905e2f190f958dbf5951456f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fa6e3afb5196decc6f087cbfe40cf8a.png)
(2)若该“钉”着地后的四个线段根据需要可以调节与底面成角的大小,且保持三个线段与底面所成角相同,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b31bf4e2816798aa17735cb329f1b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f69787ae044bb6d7d3c986d95ad59df9.png)
(3)在(2)的条件下,如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/625164153d89f3f6993a9af173f693e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceb9e0ac9f76900e254817c8177ac7f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
更新时间:2021-12-27 11:08:24
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相似题推荐
解答题-证明题
|
较难
(0.4)
名校
解题方法
【推荐1】如图,在直三棱柱
中,
,
是
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/394bb9a0-8ba4-4658-b11d-07e6a2177303.png?resizew=162)
(1)求证:
平面
;
(2)若异面直线
和
所成角的余弦值为
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4339a40ae9d1947ec3a4b3e2fa3a16cd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/394bb9a0-8ba4-4658-b11d-07e6a2177303.png?resizew=162)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1c920d02068d0e63ffdab70786c526d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73845d4d663b3de0b281611fe2c762fe.png)
(2)若异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c8f19687a166c3022c81a831127dabd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb420e9a5faa91baf74a2f687b30f514.png)
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【推荐2】如图,菱形
的边长为
,
,
,将菱形
沿对角线
折起,得到三棱锥
,点
是棱
的中点,
.
![](https://img.xkw.com/dksih/QBM/2018/6/25/1975123304800256/null/STEM/2f79d6cb40b6435bbedbe04f0d268880.png?resizew=359)
(
)求证:
平面
.
(
)求证:平面
平面
.
(
)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a14b9e6dfaf58b8159e4f2d3b9bd6645.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f4c1ba8858e3a21de22315e5a0b1353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f93febecbed16fb12a40424cc5be74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3926b75121355e46986708f3cb8cac73.png)
![](https://img.xkw.com/dksih/QBM/2018/6/25/1975123304800256/null/STEM/2f79d6cb40b6435bbedbe04f0d268880.png?resizew=359)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98ce1ac49efbb1ef090f2cec1360ca55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c6ee63b22008f64730404a63967d11.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99bfa2ca4e398c8ab0f97f47add3754f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657ffb23fab8129beb441b0c681e3dab.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c392e7a5af629bd60c1f91fbb8d5a68.png)
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【推荐1】如图,在多面体
中,平面
与平面
均为矩形且相互平行,
,设
.
平面
;
(2)若多面体
的体积为
:
(i)求
;
(ii)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d17d4a6cf11cda87b3dfafaecdec683f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dff64de03b0302dbc12f2fc207b70d1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/336e0a8f5fbc1c44a02adab5a1fffb60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dc99203b785fbdbd399bb03c7556fbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
(2)若多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d17d4a6cf11cda87b3dfafaecdec683f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a391005600bdd69c96750589f9adb048.png)
(i)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(ii)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffee8b7eff437080a0936d837ceabe95.png)
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【推荐2】如图①,是由正三角形
和正方形
组成的平面图形,其中
;将其沿
折起,使得
,如图②所示.
![](https://img.xkw.com/dksih/QBM/2021/1/26/2644559257305088/2646416300343296/STEM/8e42d118-2bbf-47ef-9334-42f57c6c66da.png?resizew=202)
![](https://img.xkw.com/dksih/QBM/2021/1/26/2644559257305088/2646416300343296/STEM/e532ecee-8a3a-4c97-a163-c9a2bf46cf5a.png?resizew=216)
(1)证明:图②中平面
平面
;
(2)在线段
上取一点
,使
,当三棱锥
的体积为
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c14a66ed4bd66df65bc42c4ac1ed15c.png)
![](https://img.xkw.com/dksih/QBM/2021/1/26/2644559257305088/2646416300343296/STEM/8e42d118-2bbf-47ef-9334-42f57c6c66da.png?resizew=202)
![](https://img.xkw.com/dksih/QBM/2021/1/26/2644559257305088/2646416300343296/STEM/e532ecee-8a3a-4c97-a163-c9a2bf46cf5a.png?resizew=216)
(1)证明:图②中平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5f0cfc1049f84a04c81bd213afb8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eac8bfbdcde7e401d1f18f9a476945e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d492a2248463e0c0199a25d0f76d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/738bc12c4d44438814ce6f606fda695a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐1】在四面体
中,有两条棱的长为
其余棱的长度都为1.
(1)若
求直线AB与平面BCD所成角的大小;
(2)若
且AB=AC=
求二面角
的余弦值;
(3)求
的取值范围,使得这样的四面体是存在的.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24305a4e30b7b9e7b9747a22bb1f7da0.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307007c5b45d38a311042aed23276cb1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49736509e20bd991c559a0ffa172573c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63547cd2634b6cc77fba8644e185e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec2524be492bca0d1566bf848066f10.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】如图所示,
为圆的直径,
圆所在的平面,B为圆周上与点A,C均不重合的点,
于S,
于N.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/6906d9e2-93a1-4648-abcb-c2c7fc0c15f3.png?resizew=211)
(1)求证:平面
平面
;
(2)设直线
与平面
所成角为
,当
变化时,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1412f25dc5307af8e8fbec3857488e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04fc0b3ec075acc4214d81086da6a1a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bed042f2f69d038b6b5c08c9ffb18a9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/6906d9e2-93a1-4648-abcb-c2c7fc0c15f3.png?resizew=211)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/160dd6825c57f16246f151bdfa07d6e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7d5ef3a3d9a03be91135fc426d57cc.png)
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【推荐3】如图,在各棱长均为2的三棱柱
中,侧面
底面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/4aecec37-1844-4012-b944-9fc113d7889e.png?resizew=171)
(1)求侧棱
与平面
所成的角;
(2)已知点
满足
,在直线
上的点
,满足
∥平面
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df00cdf77ed39ca5a0b305861a693142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe97f2b5d04e845209b7c9837e1394d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/4aecec37-1844-4012-b944-9fc113d7889e.png?resizew=171)
(1)求侧棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7d857811cbd619f868d951aa7a0ab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff7b51ee462cefcbeac8884af5d8fca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a211ad5a06b505b8365a62c1946f3cb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f354c8b4bbb473bf15c2a9c4fc1828b8.png)
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