解题方法
1 . 将一个棱长为4的正四面体同一侧面上的各棱中点两两连接,得到一多面体,则这个多面体的外接球的表面积为( )
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
2 . 如图,在长方体
中,点
,
分别在棱
上,且
,
.
(1)证明:
;
(2)若
,
,
,求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.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/b8e86e3991200297ad172455e5ea93f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/756011818142183cfc91e89bd1474bef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b0269380f0e04ad8e90c292eea56125.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/28/9056df57-6d22-4a56-a322-727de6cb5fa7.png?resizew=91)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/537bedfb076851fe8a4ae9f42c98bdd7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae8768996ca9a0f2c5d9a19abbd54df.png)
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2023-08-27更新
|
1466次组卷
|
6卷引用:浙江省杭州市塘栖中学2024届高三上学期模拟数学试题
3 . 如图,在多面体
中,四边形
是矩形,侧面
是直角梯形,
,
与
交于点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/ad75b0d4-f4c9-4ede-8de4-70574cb156a9.png?resizew=187)
(1)证明:
平面
;
(2)若
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4ffb68a9ca3bf66788363bc89dab45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d6069b03d34138cd0f51b256185040c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/ad75b0d4-f4c9-4ede-8de4-70574cb156a9.png?resizew=187)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a2f83ac39a73f4f01fb8068a0556fa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc3bf74119692ac98eb24fcfa2a3f9f.png)
您最近一年使用:0次
2023·全国·模拟预测
解题方法
4 . 如图,在正四棱柱
中,
,
,点
,
分别在棱
,
上,
,
,点
在线段
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/16/8f791d52-e5f7-4da6-9b8a-e3bb398fd974.png?resizew=145)
(1)证明:
.
(2)点
在对角线
上,当二面角
的余弦值为
时,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.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/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3362a45b72536c714c5107b0ae94f1c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6feaec58b89076ed863b8b5e95a1ec04.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/16/8f791d52-e5f7-4da6-9b8a-e3bb398fd974.png?resizew=145)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05673300310c4f6e3ccc1e0cbc1d3c76.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f74fcd77ee5f9caa9c1219658da85b4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad0278e381de9f456bfd7b44abe53203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c407eeb34204a1df967b8fbe481cb04d.png)
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5 . 在直四棱柱
中,底面ABCD为平行四边形,
,
,
,
,过点B作平面截四棱柱所得截面为正方形,该平面交棱
于点M,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19fc9f894312e55c87a0d6737080e233.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dca20c8fe7d811bdb693b2cc1970a46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c55e5f19268956dbcf8d0ce79a31db2.png)
A.2 | B.3 | C.4 | D.5 |
您最近一年使用:0次
解题方法
6 . 圆锥
的底面半径为
,母线长为
,
是圆锥
的轴截面,
是
的中点,
为底面圆周上的一个动点(异于
、
两点),则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192f4f9446c954a291f779d963f90257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192f4f9446c954a291f779d963f90257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
A.存在点![]() ![]() | B.存在点![]() ![]() |
C.三棱锥![]() ![]() | D.三棱锥![]() ![]() |
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7 . 如图在多面体
中,
,
平面
,
为等边三角形,
,
,
,点M是AC的中点.
![](https://img.xkw.com/dksih/QBM/2023/5/21/3242442990895104/3246237177798656/STEM/f4984f99fb504f4a9ccb88f9e8df5c99.png?resizew=140)
(1)若点G是
的重心,证明:点G在平面
内;
(2)求点G到
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36723bd074d43a8c98d9bd416020042c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b8173115f2297bc4c85bf7325fbef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d927585a17c2e98ef7d5a9589a26ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f32a7f0fb3cc6eaa91ad3f44b9d5610.png)
![](https://img.xkw.com/dksih/QBM/2023/5/21/3242442990895104/3246237177798656/STEM/f4984f99fb504f4a9ccb88f9e8df5c99.png?resizew=140)
(1)若点G是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5bc0580c6c53d00438fcf63bcbc5179.png)
(2)求点G到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2fecaad729e54dc1c9cea29c27d362b.png)
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8 . 在正方体
中,M,N分别为AD,
的中点,过M,N,
三点的平面截正方体
所得的截面形状为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
A.六边形 | B.五边形 | C.四边形 | D.三角形 |
您最近一年使用:0次
名校
9 . 如图,若正方体的棱长为2,点P是正方体
的上底面
上的一个动点(含边界),E,F分别是棱
,
上的中点,则正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/eb913733-3252-4a27-9376-08fd5f3fa9fa.png?resizew=172)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/eb913733-3252-4a27-9376-08fd5f3fa9fa.png?resizew=172)
A.平面![]() |
B.![]() ![]() |
C.![]() ![]() |
D.若保持![]() ![]() |
您最近一年使用:0次
2023-05-12更新
|
1031次组卷
|
3卷引用:黑龙江省实验中学2023届高三第二次模拟考试数学试卷
黑龙江省实验中学2023届高三第二次模拟考试数学试卷河北省秦皇岛市青龙县二校联考2022-2023学年高一下学期期末数学试题(已下线)考点17 立体几何中的定值问题 2024届高考数学考点总动员【练】
解题方法
10 . 如图,四棱锥
,其中
为正方形,
底面
,
,
,
分别为
,
的中点,
,
在棱
,
上,且满足
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/7ed4a1cf-1830-4c24-9e70-82b9d0bce50d.png?resizew=152)
(1)求证:直线
与直线
相交;
(2)求平面
与平面
夹角的余弦值.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c0cf7a89ea148e0481a56f127297bb2.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/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b52e2c90e1d9fc17415aeef9a574bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15120d7841b36be2453a05a9447d0de5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/7ed4a1cf-1830-4c24-9e70-82b9d0bce50d.png?resizew=152)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360496a4f5cc8a5faca5e089ae4f9531.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8be7470f11eed5536f3baf65e3a125d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
2023-05-10更新
|
434次组卷
|
2卷引用:安徽省芜湖市2023届高三下学期5月教学质量统测数学试题