如图,四棱锥
中,四边形
是矩形,
平面
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/da95d60c-bf0b-459d-8fea-0d7d0c4c0a86.png?resizew=165)
(1)证明:
平面
;
(2)若
,求三棱锥
的表面积.
![](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/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c72a40ed555c911254647cb3ee175465.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b3038b3822fa224b2984bc423d2ad0a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/da95d60c-bf0b-459d-8fea-0d7d0c4c0a86.png?resizew=165)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98a642038268517072c5de215d38449e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/723932f1d37ae7b8700bcbefee627865.png)
2023·四川攀枝花·模拟预测 查看更多[2]
更新时间:2023-11-15 00:27:58
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,矩形
的长是宽的2倍,将
沿对角线
翻折,使得平面
平面
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/045dc36f-6b9c-4785-9a69-db18b5ce2224.png?resizew=303)
(Ⅰ)若
,计算翻折后得到的三棱锥
的体积;
(Ⅱ)若
、
、
、
四点都在表面积为
的球面上,求三棱锥
的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/644f63756fe9251e65cc14e1ce9723d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8ff58f671a287701011a1b31e67e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/045dc36f-6b9c-4785-9a69-db18b5ce2224.png?resizew=303)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
(Ⅱ)若
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00b9c6b911b05fe2c41a7ba3465c30e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】如图,在三棱锥
中,
平面
为
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/e18cc6a9-83b9-4061-bf5a-753f204ef435.png?resizew=172)
(1)证明:
;
(2)若三棱锥
外接球的半径为
,求三棱锥
的侧面
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6383070ea98d9a90608f06a5b3e883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dba796944a9d8d3fe6667601e44e2f78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f0ce7aaca2b6725dac7ed5d2a437aa1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/e18cc6a9-83b9-4061-bf5a-753f204ef435.png?resizew=172)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c672f693a7e75a7bae4936dcb1920430.png)
(2)若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,已知菱形
的边长为
,
,
.将菱形
沿对角线
折起,使
,得到三棱锥
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/e16d49b7-88bf-4480-af0e-45ffb09e6a85.png?resizew=342)
(Ⅰ)若点
是棱
的中点,求证:
平面
;
(Ⅱ)求二面角
的余弦值;
(Ⅲ)设点
是线段
上一个动点,试确定
点的位置,使得
,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6906f59d09ce31956d6f5ea2b23fc77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a23f01af749100e1888bba06268843db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57abb19d63cad8f06c62f2ed75d70dce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41ffdaecfb3c73d403179e5745c71a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/e16d49b7-88bf-4480-af0e-45ffb09e6a85.png?resizew=342)
(Ⅰ)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280247d7df395bb9ea78c51e67b458d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b661fc2f6213ff6dab5e0b10bee383c5.png)
(Ⅲ)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64d9ebeeefbd4bd27023709d01b5dc95.png)
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解答题-证明题
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(0.65)
名校
【推荐2】如图,已知矩形ABCD所在平面外一点P,PA⊥平面ABCD,E、F分别是AB、PC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/8d1b4906-42f2-4383-95b0-a8407cefc3c3.png?resizew=179)
(1)求证:
;
(2)若∠PDA=45°,求EF与平面ABCD所成角的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/8d1b4906-42f2-4383-95b0-a8407cefc3c3.png?resizew=179)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8082db50586c0b735c9b8b5822c1156.png)
(2)若∠PDA=45°,求EF与平面ABCD所成角的大小.
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
名校
【推荐1】如图,在四棱锥中,
,四边形
是菱形,
是棱
上的动点,且
.
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99a9bfe6e74558b2129cbccc6f6a776.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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名校
【推荐2】如图,在三棱柱
中,
,
为
中点,
.
(1)求证:
;
(2)线段
上是否存在一点
,使得
与面
的夹角正弦值为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655a0998080bfc32e7fdbbd07a306259.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/3ad8eccbf3e56796afb81081d3501258.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/30/199756d8-6dea-4cf4-9c53-2b068c7858f7.png?resizew=142)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80803823c1d79b719e7f0155f82a1876.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e4c008b9fa008ada4f51a20e60c5d09.png)
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解答题-证明题
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适中
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【推荐3】如图,已知
平面
与底面
所成角为
,且
.
平面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31a124f5f318ac67b6d6b3c47ebc2ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da2de4496cec1d28745ce7a042883d0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a0787d2cb66d00c49d3348b52acd407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715cc9ea5e7d80930284ffb117142770.png)
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