解题方法
1 . 已知
是底面边长为1的正四棱柱,
为
与
的交点.
与底面
所成角的大小为
,异面直线
与
所成角的大小为
,求证:
;
(2)若点C到平面
的距离为
,求正四棱柱
的表面积;
(3)若正四棱柱
的高为2,在矩形
内(不包含边界)存在点P,满足P到线段BC的距离与到线段
的距离相等,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48de102fadeee495637087066a2a6b01.png)
(2)若点C到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae7f4612c548b1f72a964ddb291cd2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
(3)若正四棱柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcab96f97a5e202ba9220bac5280e4f3.png)
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2 . 把底面为椭圆且母线与底面垂直的柱体称为“椭圆柱”.如图,椭圆柱
中底面长轴
,短轴长
为下底面椭圆的左右焦点,
为上底面椭圆的右焦点,
为
上的动点,
为
上的动点,
为过点
的下底面的一条动弦(不与
重合).
为
的中点时,
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ce50ba5e349425274f05d46d120a74.png)
(2)若点
是下底面椭圆上的动点,
是点
在上底面的投影,且
与下底面所成的角分别为
,试求出
的取值范围.
(3)求三棱锥
的体积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/270ddac9587bf1ea553914cb69595ab2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a171cc0cc99f030004562afbbc076d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd017ff847f31f37593d9c864fc1f12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44d8b20bcb61ee074d884ef80a3c4a99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d91906f65d3c6ce459c1f1efb93363b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](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/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f555e56d727bcfe7c456a58883c5b8a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ce50ba5e349425274f05d46d120a74.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a42da28be159399514cc6179a96e34b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50de09eab1f2599073e4f97b89a6e80e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89c79fc0cb461a911eb17f7d49f9f117.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64297d81fb65426718be766c90c74cfc.png)
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3 . 设四边形
为矩形,点
为平面
外一点,且
平面
,若
,
.
与平面
所成角的大小(用反三角函数表示);
(2)在
边上是否存在一点
,使得点
到平面
的距离为
,若存在,求出
的值,若不存在,请说明理由;
(3)若点
是
的中点,在
内确定一点
,使
的值最小,并求此时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/0e7b6d04f024ca05cdfacc8ce9137c15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4180c271831327644dc83240b715b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c107850c8b505d853610d19e6ffbb4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca14f6100d829f197a5dac5197bbe0b1.png)
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4 . 已知平行六面体
,底面
为菱形,
,侧棱
.
(1)证明:直线
平面
;
(2)设平面
平面
,且二面角
的平面角为
,设
点为线段
的中点,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c7f93141ec82fe63ce71803f2e5435f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/130837bf4960e5fd29c69d7b0c9f557a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/10/22cd9621-590b-432f-afe4-7831c178c634.png?resizew=207)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f4d9c3f1e496cc3fa3401ffaedd7e6.png)
(2)设平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/035cec49fde6fdf4bdbdc59ecbd8f7ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25cf5e1e2d2b61e7d9b488faf4284165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77cad740e2ced707c3b4a22126579a47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5ba99bbb70c1f24afdd9ad9b5e32e1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0f0ccc8492a0ccf1eee24867060643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b81f1bce5be292fb6968afc5e07864f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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5 . 如图,平面
平面
,四边形
为矩形,且
为线段
上的动点,
,
,
,
.
为线段
的中点时,
(i)求证:
平面
;
(ii)求直线
与平面
所成角的正弦值;
(2)记直线
与平面
所成角为
,平面
与平面
的夹角为
,是否存在点
使得
?若存在,求出
;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9367449a5847eade07e69f4feddcb027.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af260e0d98c95d1e092dc4c6d348e3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58052cd7d89b0d8556f5a082162dc324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6abed28fd7b66cc392d16edc057d834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(i)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0edb1508fc95765f3bb316bcb5252d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
(ii)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2730b513bd3359c3dfe6567e04f5ef9.png)
(2)记直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2730b513bd3359c3dfe6567e04f5ef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2246c0e92e8cc344f636ea8f8f9037e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2730b513bd3359c3dfe6567e04f5ef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa3205b1df826d63914dcb55bb3ab43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
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6 . 如图所示,有满足下列条件的五边形的彩纸
,其中
,
,
.现将彩纸沿
向内进行折叠.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/b7616fed-c78f-417e-952c-7cc82b6117d0.png?resizew=425)
(1)求线段
的长度;
(2)若
是等边三角形,折叠后使
⊥
,求直线
与平面
的所成角的大小;
(3)将折叠后得到的四棱锥记为四棱锥
,求该四棱锥的体积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8beaa6c45dc8fe05380f5a9770080a1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f81aae27dd6c2c3af7756c81ceb03f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb656194a6acbb28ecd6669814085a52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/b7616fed-c78f-417e-952c-7cc82b6117d0.png?resizew=425)
(1)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
(3)将折叠后得到的四棱锥记为四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
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解题方法
7 . 已知四面体
(如图
的平面展开图(如图
中,四边形
为边长为
的正方形,
和
均为正三角形,在四面体
中:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/03ac9cd4-6c98-490e-a909-e1f4e3dd1c05.png?resizew=387)
(1)证明:平面
平面
;
(2)求二面角
的余弦值;
(3)在图1中作出直线
与平面
的所成角,并求出直线
与平面
的所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdcf8a317ccc87a1bf8e17852fddbe29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad217e26bd3580c35998109de14cef73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6830ebecddbd9759be626289c408e4f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/03ac9cd4-6c98-490e-a909-e1f4e3dd1c05.png?resizew=387)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a438393ddfc7da1804baf4932442bb35.png)
(3)在图1中作出直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4d781525777c7b5284dffc70b2a28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4d781525777c7b5284dffc70b2a28a.png)
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解题方法
8 . 如图,在四棱锥P﹣ABCD中,底面是矩形,且AD=2,AB=PA=1,
平面ABCD,E,F分别是线段AB,BC的中点.
;
(2)求四棱锥P﹣ABCD的表面积;
(3)求直线PE与平面PFD所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fb2fbbce7207d2b2bdd5c5ab61ecd04.png)
(2)求四棱锥P﹣ABCD的表面积;
(3)求直线PE与平面PFD所成角的大小.
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2022-11-20更新
|
653次组卷
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7卷引用:上海市进才中学2021-2022学年高二上学期期中数学试题
上海市进才中学2021-2022学年高二上学期期中数学试题(已下线)上海高二上学期期中【易错、好题、压轴60题考点专练】(2)上海市华东师范大学第三附属中学2021-2022学年高二上学期12月月考数学试题(已下线)10.3 直线与平面所成的角 (第4课时)(作业)(夯实基础+能力提升)-【教材配套课件+作业】2022-2023学年高二数学精品教学课件(沪教版2020必修第三册)上海市崇明中学2023届高三下学期第一阶段练习数学试题(已下线)第11章 简单几何体(压轴必刷30题专项训练)-【满分全攻略】2023-2024学年高二数学同步讲义全优学案(沪教版2020必修第三册)(已下线)期中真题必刷压轴50题专练-【满分全攻略】2023-2024学年高二数学同步讲义全优学案(沪教版2020必修第三册)
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9 . 如图,在长方体
中,
,点E在棱
上运动.
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897861440520192/2899173062377472/STEM/e4d464a5-f1bc-4cfa-9749-41c695b3fb24.png?resizew=183)
(1)证明:
;
(2)当E为棱
的中点时,求直线
与平面
所成角的正弦值;
(3)
等于何值时,二面角
的大小为
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5fe4c0fbef40e7ce6f34da8e2ad6e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897861440520192/2899173062377472/STEM/e4d464a5-f1bc-4cfa-9749-41c695b3fb24.png?resizew=183)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3af2fef79a35d44f9e11f9d8c5b3f08b.png)
(2)当E为棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb66e4fa5ca4231b8ce2490eeb192b.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14f7c5a38ee674e24a83426a17906532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a8f3a8b0608ec011ad95c522fd2ea4d.png)
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10 . 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)
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