如图(1),在直角梯形
中,
,
,
,
,
、
、
、
分别为
,
,
的中点,现将
沿
折起,使平面
平面
,如图(2)所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/76890c58-3b23-4767-995e-e204b332d76e.png?resizew=343)
(1)求证:
平面
;
(2)求证:
;
(3)求四棱锥
的外接球的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b027ed57b9c6f24e27ec0ae282c76efa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ace3f86d71ba55a0bd713a047e5b33c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0910601e7d760188d10beee6a48f2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb46c641aa0616b3b09d596dda500ab.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36aae82d53f2a35d2f95f467bd5b76cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ad6a0124359e8b9f7649cf0bff51ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/76890c58-3b23-4767-995e-e204b332d76e.png?resizew=343)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12d8677ae5ca7acf874d93789425d172.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6f0924f5e8c41bc712466dade948a7.png)
(3)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
15-16高一上·甘肃兰州·期末 查看更多[2]
更新时间:2016-12-04 03:25:41
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】已知一个正三棱锥的四个顶点都在一个球的球面上,而且这个正三棱锥的所有棱长都为2,求这个球的体积.
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,是四棱柱
的三视图.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/272cd147-2a32-4f39-ae9e-45f069f7b563.png?resizew=167)
(1)判定四棱柱是何种几何体,并画出其的直观图;
(2)求四棱柱
的外接球面的面积
(3)求四面体
的体积;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/272cd147-2a32-4f39-ae9e-45f069f7b563.png?resizew=167)
(1)判定四棱柱是何种几何体,并画出其的直观图;
(2)求四棱柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
(3)求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68ac02c2f91cadb1e328bc6ab9b9c491.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在四棱锥
中,底面
是矩形,
,
平面
,
为
中点,且
.
(1)求证:
∥平面
;
(2)求直线
与平面
所成角的正弦值.
![](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/f80f51c31583fea58fde645474d60b8a.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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/27/02af04b3-7869-41e8-8c1a-079affaaca73.png?resizew=149)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
【推荐2】一块三棱锥形木块如图所示,点
是
的重心,过点
将木块锯开,使截面平行于侧面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/25/b8a72bec-3a9e-49a6-8f18-9456a78b6e4f.png?resizew=287)
(1)画出截面与木块表面的交线,并说明理由;
(2)若
为等边三角形,
,求夹在截面与平面
之间的几何体的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e08c39e44b50d0cac4a10106f8d09339.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21665d21bbfb04410c78345de1fd15ae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/25/b8a72bec-3a9e-49a6-8f18-9456a78b6e4f.png?resizew=287)
(1)画出截面与木块表面的交线,并说明理由;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a247901115439b304177d3ec114d3b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21665d21bbfb04410c78345de1fd15ae.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】如图,在几何体
中,四边形
为等腰梯形,且
,
,四边形
为矩形,且
,M,N分别为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/2174d628-a7dd-4bb1-aff1-11bfe202097e.png?resizew=132)
(1)求证:
平面
;
(2)若直线
与平面
所成的角为
,求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6045266f6db39e41b7abde762d9e9a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbc56d42b003cbcb1fbe5c50e55b26b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c545be1051b20aea348bc99505c27022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cbdf026679286d29788137c55893d37.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/2174d628-a7dd-4bb1-aff1-11bfe202097e.png?resizew=132)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2db1674add0f4a1a24f5ed893b1c5d0.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1feced80dcf03c30cf0768cba4acddd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf2f0df53aa68c9c334165034788166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb304d905125170bebfada27e7ed8960.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】如图三棱柱,
为菱形,
,
,
为
的中点,平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/d142a27b-c168-42fe-8589-fd46fd7bcb72.png?resizew=179)
(1)求证:
;
(2)若
,
,求二面角
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/040bece4d468e2353832b1cbe35d9dfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8d3a3f9bae62377ff6e18e7d94e21d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/d142a27b-c168-42fe-8589-fd46fd7bcb72.png?resizew=179)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5485a6bc3ba67f92a37d38a15d515a25.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cad94a7ce4b201a9e95674e19d828d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5983c84ac412b4683ed0dc664883177.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知直三棱柱
中,侧面
为正方形,
,E,F分别为AC和
的中点,D为棱
上的点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/ec63c8b9-2ce5-4713-acaa-03b0c8d15684.png?resizew=135)
(1)求证:
:
(2)当
时,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/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0023280949eda97787964f0a9d41ed2e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/ec63c8b9-2ce5-4713-acaa-03b0c8d15684.png?resizew=135)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a7a3dc3f3a02f4400e22dec2f2fee23.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97685285fc594a91098e09b0374b17c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
您最近一年使用:0次