如图,在圆台
中,
分别为上、下底面圆的直径,且
,
,
为异于
的一条母线,点
在线段
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/8/53391d7c-4036-4cbf-9565-9ac1574e39e2.png?resizew=198)
(1)求证:
平面
;
(2)若
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192f4f9446c954a291f779d963f90257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80d95c5e05e4249f1b06381703aa1695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147ce46290b9aeb0092af30b2d3001c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e05c4eff7615455af8500fa211b0b071.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ad4812d6bdbae06af6a140aec881ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2367daecf780285b02961fb4cf529dff.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/8/53391d7c-4036-4cbf-9565-9ac1574e39e2.png?resizew=198)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ea06786d3f6a9f5f520a63135947ec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c2407592e5e95f1b799940e5635a53e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a56406c1eddfe9116cabab765d4282bc.png)
更新时间:2023-05-07 11:43:51
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,三棱柱
中,侧棱
平面
,
为等腰直角三角形,
,且
,E,F,G分别是
,
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/1904b19f-22b5-422c-a600-6bb0e4867fb1.png?resizew=174)
(1)求证:
平面
;
(2)求直线
与平面
所成的角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baa3d0db9ad31d33c2883a6efed1dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/1904b19f-22b5-422c-a600-6bb0e4867fb1.png?resizew=174)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f60d66204e1abc17bd01749f187f8050.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】在平行六面体
中,
,平面
底面
,点
是线段
的中点,点
是线段
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/5091e71e-9205-476c-ae2e-714c81d878d0.png?resizew=192)
(1)求证:
平面
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd694ad3a4733c7c84aaa7946aeea4de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0565379b7d7fa0ccc55ec620cc74edcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c640abbdc470479407da1ae2aa80fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/5091e71e-9205-476c-ae2e-714c81d878d0.png?resizew=192)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a4a94e889d2869ea84082575fae52ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9089ed0ec2755f151e6045f2ee7501.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/086077a865cec74b416e40a57bbbc778.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,在三棱柱
中,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/17/8aba6356-3813-450b-962a-b303a1286d21.png?resizew=163)
(1)证明:平面
平面
;
(2)若
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7ad3a578f403b9e6b97fa2dc955fc11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1be17e0a3e51cde1f50f384198e71e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f06c1cedcc4406a91783f9d37cab421e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e3c9e7c05de9838c0c5d762720d3ef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/17/8aba6356-3813-450b-962a-b303a1286d21.png?resizew=163)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e53b212640dadf751ef7f65a78a209.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d3a9f832c20d05940e7072552aaede3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/130e68a02a2aa5b667c46401732d6284.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图1,在梯形
中,
,
,垂足为
,
,
.将△
沿
翻折到△
,如图2所示.
为线段
的中点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/5e357f61-26b7-455f-850a-87dd1d47efb2.png?resizew=385)
(1)求证:
;
(2)设
为线段
上任意一点,当平面
与平面
所成锐二面角最小时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4611ceb2a28f7a7e4d24266d7f99b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c766b11f10d07be9540433a0083fddb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb55961fe96e155242d18d98e5c2261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6c2dad46a9052a4185a4f7b4ae8a2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c7e2ffbc2b2eda106cda5d75003af60.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/5e357f61-26b7-455f-850a-87dd1d47efb2.png?resizew=385)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f22f74a1995a5b5fa2a0536606ce1df.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212a67f115d1cbe69f100b489babe5f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9068f29d671d76d1e95ba3a4eaff5b96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐3】在底面为正三角形的三棱柱
中,平面ABC⊥平面
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/5/4/2972220225667072/2974826993844224/STEM/8fa6d014-ff8e-4d6a-9984-2979fbb56668.png?resizew=204)
(1)证明:
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f2e238b2757353026133bbe495645e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95196d4658088f565e495c005cfed5a4.png)
![](https://img.xkw.com/dksih/QBM/2022/5/4/2972220225667072/2974826993844224/STEM/8fa6d014-ff8e-4d6a-9984-2979fbb56668.png?resizew=204)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14a6861183185b69fc1d8a9148d4e26d.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fdd765222857ce3fb478de387d23512.png)
您最近一年使用:0次