如图,已知三角形
是等腰三角形,
,
,
,
分别为
,
的中点,将
沿
折到
的位置如图2,且
,取线段
的中点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/d24b0ca2-1c80-4a4f-958e-62ba4a013730.png?resizew=247)
(1)求证:
平面
;
(2)求点
到面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85d7c0126e753ca02dbab9c41829d31e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99b994835978bf95118d74885133a94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da4da3fe00569551b54fd3c9ee28864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad895b1c422b40c35be89c8bef22e834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ca15691dfea154b932004966f2fbca3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a94e59ad6695d077e3f31d330d5734.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/364d6c88726d8c3bb8ed297057332bac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/d24b0ca2-1c80-4a4f-958e-62ba4a013730.png?resizew=247)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d27ff0b39832f094ec51e28721d739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
更新时间:2023-04-25 17:38:32
|
相似题推荐
【推荐1】如图,在正方体中,
分别是
的中点.
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feaebfb39942834d42f516cff3bcd117.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408871c2b71ef88d6f556ce53cf73cc9.png)
(3)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec43f7352b3a8c194b4c37485fb4ffd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd0cb774b7e17aaf31faa00741db2330.png)
(4)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ddc8a83b5e5b7342e60400f9fcb46fc.png)
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解题方法
【推荐2】在长方体
中,
,P为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/972bff60-3f4a-4e43-bad5-e47986a13a3d.png?resizew=255)
(1)已知过点
的平面
与平面
平行,平面
与直线
分别相交于点M,N,请确定点M,N的位置;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed557e33dca77e3a0257601967aae3a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/972bff60-3f4a-4e43-bad5-e47986a13a3d.png?resizew=255)
(1)已知过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0e9053b90f36cee8a6b118681a15ceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc9b42d16569ad69c38883534a0be16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecba79b0285803b1bc62d406d568b016.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc9b42d16569ad69c38883534a0be16.png)
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【推荐1】已知正四棱锥
的底面边长和侧棱长均为
,
、
分别是
、
上的点,且
.
![](https://img.xkw.com/dksih/QBM/2017/10/10/1792262417530880/1793795300614144/STEM/719be39f8be9435cbd58b327de818392.png?resizew=191)
(1)求证:直线
∥平面
;
(2)求直线
与平面
所成的角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5453184e251cfe787b5965cd38426962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ad4c07d703bf1bfce7b6cff76cdd4.png)
![](https://img.xkw.com/dksih/QBM/2017/10/10/1792262417530880/1793795300614144/STEM/719be39f8be9435cbd58b327de818392.png?resizew=191)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】如图,四棱锥P﹣ABCD中,底面ABCD为梯形,AB∥DC,∠BAD=90°,点E为PB的中点,且CD=2AD=2AB=4,点F在CD上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/25c66b62-d8a5-43ec-a276-379a78770173.png?resizew=171)
(Ⅰ)求证:EF∥平面PAD;
(Ⅱ)若平面PAD⊥平面ABCD,PA=PD且PA⊥PD,求直线PA与平面PBF所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a986e6cfd114c3c7978be62259e7c19d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/25c66b62-d8a5-43ec-a276-379a78770173.png?resizew=171)
(Ⅰ)求证:EF∥平面PAD;
(Ⅱ)若平面PAD⊥平面ABCD,PA=PD且PA⊥PD,求直线PA与平面PBF所成角的正弦值.
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【推荐1】在圆锥
中,点
,
,
,
在底面圆
上,
为圆
的直径,
,
,
,
分别是
,
靠近
,
的三等分点,平面
交
于点
.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712397636018176/2717244272369664/STEM/5b0b7dd0-f3c5-4afb-ba7c-d5d3c7fea63c.png?resizew=319)
(1)证明:
平面
;
(2)当
时,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de993f61fd1df907ea92daed1ccc50af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90dbe55407b556be48d67cde5c5dc94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712397636018176/2717244272369664/STEM/5b0b7dd0-f3c5-4afb-ba7c-d5d3c7fea63c.png?resizew=319)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b6aeaf411b82c8a3b2770ac1262cc62.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f666717a400c3218d1a2df33b9bf0ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d583183429b6b31aa9742eefc67d3181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
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解题方法
【推荐2】如图,三棱锥
中,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/edacdbce-e2fa-4c98-af4d-01bf1e43d9e7.png?resizew=159)
(1)求证:平面
平面
;
(2)若点
是
上的动点,试求
的长,使得二面角
的大小为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a7cfe231da777ed2b8d75cca53e89f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0e5697eca3f5205cb7b343648240bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c61e19caea8882d3845e821b5c095a9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/edacdbce-e2fa-4c98-af4d-01bf1e43d9e7.png?resizew=159)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17580410bf63dba4fe164265afaac4cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4019805fed3b6cca619f4035e7618cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
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【推荐3】如图,在四棱锥
中,底面ABCD为正方形,平面
平面ABCD,Q为棱PD的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/b81cec99-39da-4902-ba3d-5945d1980230.png?resizew=176)
(1)求证:
平面ABCD;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6be2b61f4a38e2ee2c1a01e00b3ae6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2c4cc37d6ba218107c9c5d820740fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d30b1b625418c79f4d08bdf4d65dc66.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/b81cec99-39da-4902-ba3d-5945d1980230.png?resizew=176)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afb18c7c5391647214d4da31a88202d2.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a75cbcc99fef5b63a9680a467514718.png)
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适中
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【推荐1】如图,在底面是菱形的四棱柱
中,
,
,点
在
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/df8c1e7c-4008-4baf-8586-57306868ad3e.png?resizew=182)
(1)求证:
平面
;
(2)当
为线段
的中点时,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05740f0c6071846227dc0ec177ad15e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/253a748d7f10f776c981d53a6d900db6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/df8c1e7c-4008-4baf-8586-57306868ad3e.png?resizew=182)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
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【推荐2】如图,在四棱锥
中,底面
为平行四边形,
,
,
,
平面
.
(1)求证:
面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)若_______,求点
到平面
的距离.
在①
;②二面角
的正切值为
;③
,这三个条件中,任选一个,补充在问题中,并加以解答.
![](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/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf7679c8b4b1e442ce4286d4b0e9c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/23/7b5bc07e-81f5-4c64-a9a1-d90018b69be6.png?resizew=166)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)若_______,求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
在①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1636b4530c0b42d0e0b649e90e3b9e85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1bac478d1591943bb7d17edac3e8192.png)
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