如图,在直三棱柱
中,
,
.
(1)设平面
与平面
的交线为l,判断l与
的位置关系,并证明;
(2)若
与平面
所成的角为
,求三棱锥
内切球的表面积S.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af89996db5c5b01c09a448c8e2e47b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1240a927e5540d2dce76ba019f6cf82.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/7/3650d5da-c50e-4f71-b5f2-8d80f60bd852.png?resizew=162)
(1)设平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38593653bedb845ecfa820806a29a1e.png)
更新时间:2023-07-06 08:59:52
|
相似题推荐
解答题-问答题
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解题方法
【推荐1】已知三棱锥
,
,
平面
,其中
,
四点均在球
的表面上,求球
的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4278c0911e7df78965e78cff69cac5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dc220e327187d0f787547e517f4ade.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4317430d5a2b61d9a2a88b73e7d7ad39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa3a310c1f8a5af35dc3328d874e18e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/146637bccb0df20613073bf192a5a898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7147ca48d60f169fab98d1f8aa3287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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【推荐2】已知长方体
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/6c4df34e-e2b9-4344-9ffe-4f25d984e85f.png?resizew=157)
(1)若
,求异面直线
和
所成角的大小;
(2)若三个相邻侧面的对角线长分别为
,2,
,求外接球的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/6c4df34e-e2b9-4344-9ffe-4f25d984e85f.png?resizew=157)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28d30e49e97f35ea7b40ec44a7e69c1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
(2)若三个相邻侧面的对角线长分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
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【推荐1】如图1所示的等边
的边长为2a,CD是AB边上的高,E,F分别是AC,BC边的中点.现将
沿CD折叠,使平面ADC⊥平面BDC,如图2所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/2c38dae2-17d6-4238-9880-d8fa92ff7656.png?resizew=304)
(1)试判断折叠后直线AB与平面DEF的位置关系,并说明理由;
(2)求四面体
的外接球体积与四棱锥
的体积之比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/2c38dae2-17d6-4238-9880-d8fa92ff7656.png?resizew=304)
(1)试判断折叠后直线AB与平面DEF的位置关系,并说明理由;
(2)求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4709975e737058db2e0e329094ab72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/646faad545eba4860a41cd8480b8a3c0.png)
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【推荐2】如图所示,已知斜三棱柱
,侧面
为菱形,点
在底面ABC上的射影恰为AC的中点D,
,
.
![](https://img.xkw.com/dksih/QBM/2022/7/12/3020919869677568/3021835983044608/STEM/adf1642f912347799bbdf01e8af10ba7.png?resizew=179)
(1)求证:
平面
;
(2)求四面体
外接球的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209acf15985d1ea1ad86fc4a37e38c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://img.xkw.com/dksih/QBM/2022/7/12/3020919869677568/3021835983044608/STEM/adf1642f912347799bbdf01e8af10ba7.png?resizew=179)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1d2e0f281222a5f289ea4008370aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/255508daedce71b78029b7bfc26eec74.png)
(2)求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38593653bedb845ecfa820806a29a1e.png)
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解题方法
【推荐1】如图,五面体ABCDEF中,四边形ABCD为等腰梯形,
,且
.
![](https://img.xkw.com/dksih/QBM/2022/3/2/2927641433530368/2929512353562624/STEM/5ceb500c-31b1-4181-b8a0-e2e200b414cd.png?resizew=150)
(1)求证:
平面ACF;
(2)若平面
平面ABCD,且平面
平面ABCD,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b559395cde38c4955fad4ff07ac4635.png)
![](https://img.xkw.com/dksih/QBM/2022/3/2/2927641433530368/2929512353562624/STEM/5ceb500c-31b1-4181-b8a0-e2e200b414cd.png?resizew=150)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75aea24647cd4d0b4b9aa513bf5457b0.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a5628323a7eeb11213df5c9048b3543.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3fb82553d568ea8aae9d0dd89ae1ca2.png)
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解题方法
【推荐2】如图,在直三棱柱
中,
,
,
为
上的点,
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/2119522c-4957-4f6b-bfa4-8572613fc22f.png?resizew=207)
(1)求证:
平面
;
(2)若
,且
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea6ff6a807f5639faac835012b3728c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df66362082c13c887223771b92a1f6c.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/547a4b438e2e6687c7cd55ea08bbaae2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/2119522c-4957-4f6b-bfa4-8572613fc22f.png?resizew=207)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e53b212640dadf751ef7f65a78a209.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a02cfc067dc5299ebb16f6378f90ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1157a6da4c4028b7216f7c9740d63aee.png)
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【推荐3】在四棱锥
中,底面ABCD为正方形,G为线段PC上一点,若平面
平面
.
![](https://img.xkw.com/dksih/QBM/2022/3/21/2941004870279168/2941946012319744/STEM/00fcb05e-62c9-4771-acbb-f65e3ee64d9a.png?resizew=201)
(1)若G为线段PC的中点,求证:
.
(2)若平面
平面ABCD,
为等边三角形,若二面角
的余弦值
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ed1a9503b929dac0750699303336925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/747e7c4b2f940a9f0a7300a5d0f11cdb.png)
![](https://img.xkw.com/dksih/QBM/2022/3/21/2941004870279168/2941946012319744/STEM/00fcb05e-62c9-4771-acbb-f65e3ee64d9a.png?resizew=201)
(1)若G为线段PC的中点,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ea7223d051ed407051e731b8a05c528.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1e8ddfbcb0746c371d05d072c45146f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/924d32b574fe69e43724304cf39513e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3b1771fbc438ff888bd28bb1dadcee.png)
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【推荐1】如图,在四棱锥
中,底面
为直角梯形,其中
,
,
,
为棱
的中点,
是棱
上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/24/6e29cbb9-b9d7-480a-b6e8-61c771c019cb.png?resizew=183)
(1)证明:
平面
;
(2)若
,直线
与平面
所成的角为
,求平面
与平面
夹角的余弦值.
![](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/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ee81b6066188abee9d167b6c7f3f71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c2b46a4bf9b4de6bc88e86cadccd32a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/24/6e29cbb9-b9d7-480a-b6e8-61c771c019cb.png?resizew=183)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aad8956f47a1dd645514aac3e77a5fed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f239fbcc58fc15535db4b5084c4f7253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f35614aff055b98b76ca262f64e629d.png)
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【推荐2】矩形ABCD,PD
平面ABCD,若PB=2,PB与平面PCD所成的角为
,PB与平面ABD成
,求:
![](https://img.xkw.com/dksih/QBM/2021/3/12/2676438710001664/2683962777108480/STEM/357275f3ca5a48b1a4ba117939a0fb9f.png?resizew=192)
(1)CD的长;
(2)求PB与CD所成的角
(3)求二面角C-PB-D的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
![](https://img.xkw.com/dksih/QBM/2021/3/12/2676438710001664/2683962777108480/STEM/357275f3ca5a48b1a4ba117939a0fb9f.png?resizew=192)
(1)CD的长;
(2)求PB与CD所成的角
(3)求二面角C-PB-D的余弦值.
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【推荐3】如图,在四棱锥
中,平面
平面
,
,
,
,
,
,
,
分别为
,
的中点,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/3a8d847e-3074-4285-a6e5-29b01fe29efa.png?resizew=145)
(1)求证:
,
,
,
四点在同一球面上,并说明球心及半径;
(2)画出平面
与平面
的交线(不需要写画法).
(3)设平面
与平面
的交线为
,直线
与平面
所成角的正切值为
,求平面
与平面
所成的锐二面角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5c044e1f89e113f1f4f63cf60c7518.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5729dd997ea7e8cb4cef8b7165b36e00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18120a244d3a1f9c1688bf53eb2ad775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/3a8d847e-3074-4285-a6e5-29b01fe29efa.png?resizew=145)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)画出平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
(3)设平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e108d5c61e85e0741ec2c484fc5768.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ef4b918d022644e812c610a7308019.png)
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