如图,直三棱柱
中,
,且平面
平面
.
(1)求BC的长;
(2)求直线AC与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0b07c9804a4201ed95635c26727401a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a2e10a5aebe40a9018d5ee3ade7af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/5/c48fafbb-8701-4217-b2f9-17b0fb9364b6.png?resizew=179)
(1)求BC的长;
(2)求直线AC与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
更新时间:2023-07-04 23:45:28
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,四棱锥
中,底面
为正方形,
平面
,
、
分别是棱
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/427c4401-61fb-40b3-a654-ac1742db4757.png?resizew=149)
(1)求证:
平面
;
(2)求证:
.
(3)已知正方形
的边长为2,
,求:
①异面直线
所成角的余弦;
②直线
与平面
所成角的正弦.
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/427c4401-61fb-40b3-a654-ac1742db4757.png?resizew=149)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c672f693a7e75a7bae4936dcb1920430.png)
(3)已知正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
①异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2682f3f3f0f72c893b99073bcac83ff2.png)
②直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
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解答题-问答题
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适中
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【推荐2】在三棱锥D-ABC中,底面
为等边三角形,DB⊥DC,且DB=DC,E为BC的中点.
![](https://img.xkw.com/dksih/QBM/2020/8/10/2524853480660992/2527882073432064/STEM/836b14e94bc04e89a2ec445883d730f9.png?resizew=200)
(1)证明:AD⊥BC;
(2)若平面DBC⊥底面ABC,求AE与平面ADB所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2020/8/10/2524853480660992/2527882073432064/STEM/836b14e94bc04e89a2ec445883d730f9.png?resizew=200)
(1)证明:AD⊥BC;
(2)若平面DBC⊥底面ABC,求AE与平面ADB所成角的正弦值.
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【推荐1】如图,在正四棱台
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/e9d69856-04dd-48c7-839d-170db58ca0f7.png?resizew=202)
(1)证明:
平面
;
(2)若正四棱台
的侧棱长为
,过直线
的平面
与
平行,求平面
与平面
夹角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbc47e8015e70a20456c25f742d54cae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/e9d69856-04dd-48c7-839d-170db58ca0f7.png?resizew=202)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39f332eb13e2379aeedb236434947a8f.png)
(2)若正四棱台
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e20838e72faf737614d76fcee82ab6c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
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解答题-证明题
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解题方法
【推荐2】如图,在三棱锥
中,
,点D是棱
的中点.
![](https://img.xkw.com/dksih/QBM/2022/1/22/2899907775348736/2921167411814400/STEM/fd1e8f0d-a3a6-446e-9983-6ab9d71717d5.png?resizew=168)
(1)求证
;
(2)若
,点E在棱
上,且
,求点C到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee5a6d7e06b468a8921835d10c44a827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2022/1/22/2899907775348736/2921167411814400/STEM/fd1e8f0d-a3a6-446e-9983-6ab9d71717d5.png?resizew=168)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c65334978b0519b379910dfc4acf8344.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f60c68102af27fbf7a443be683e733d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e73c8c1d2ba6b29b301380a45dfbcdd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37793a3a810e823e10c340986f55ddd.png)
您最近一年使用:0次
解答题-证明题
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名校
【推荐3】如图,在三棱柱
中,
,
,平面
平面
,
为
中点.
![](https://img.xkw.com/dksih/QBM/2018/5/8/1941134183358464/1942339713712128/STEM/e5f4f96b011e4219951db3a1b1689635.png?resizew=178)
(1)求证:
;
(2)若
直线
与平面
所成角为
,求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929fad66226226ceff3b3252c60d9ed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50d9bdbbdfabc737323692c796e41930.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/2018/5/8/1941134183358464/1942339713712128/STEM/e5f4f96b011e4219951db3a1b1689635.png?resizew=178)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a27bad0636a087e38bb1d253d66a231d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/133380070b96b414af75ee0352d1045a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07350b106ef6b3e89063ff10709b4806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30c20e88a33043f4279fff360c81006e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914d46f7e72b55d2ff3d9bc38e02b31d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
解答题-证明题
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解题方法
【推荐1】如图,在四棱锥
中,底面ABCD为正方形,
为等边三角形,E为PC的中点,平面
底面ABCD.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/71824662-f4c7-4734-a4fc-909178ecbc43.png?resizew=156)
(1)求证:
底面ABCD;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acee03d4bb4667b6c345221b6c9b0fa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54cf75bbfc9db93d27937c8b8e977b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/71824662-f4c7-4734-a4fc-909178ecbc43.png?resizew=156)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370148e9147aa25c60a07ab4ad46e83d.png)
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解答题-问答题
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适中
(0.65)
解题方法
【推荐2】如图,四棱锥
中,
是
的中点,
,
,且
,
,又
面
.
![](https://img.xkw.com/dksih/QBM/2012/1/12/1570686075109376/1570686080532480/STEM/200565156cdf49dfa29518078020d627.png?resizew=205)
(1) 证明:
;
(2) 证明:
面
;
(3) 求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/578b8b2e929abc6e2fb4843cfb63e5a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb2e071d4e01107dcf7d95cbb86b415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
![](https://img.xkw.com/dksih/QBM/2012/1/12/1570686075109376/1570686080532480/STEM/200565156cdf49dfa29518078020d627.png?resizew=205)
(1) 证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92a5e26777d63a3ac58a78b50c737a2a.png)
(2) 证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5865d488a9cf1181016fd2e866177cdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d923a338dd2d2e29336b42574d38448.png)
(3) 求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
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【推荐3】在三棱锥
中,
平面
,
,点
在平面
内,且满足平面
平面
垂直于
.
时,求点
的轨迹长度;
(2)当二面角
的余弦值为
时,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8248c6a53aaa9419370f1d8adf2db72f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d96357a07048ba79b8c84097d359d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcf3ef95ed4461294d5a756af7592860.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9989226d2596116d91a611de93d03dbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)当二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dde460d9f9825efb46557f38318e3f0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8964e388fc0da7f6dd81bb9bda44f2a5.png)
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