1 . 如图,在五棱锥
中,
,且
.
![](https://img.xkw.com/dksih/QBM/2016/12/27/1619411074736128/1619411075375104/STEM/c83a9c6e4b444cf9ad7b80d76e8051e0.png)
(1)已知点
在线段
上,确定
的位置,使得
;
(2)点
分别在线段
上,若沿直线
将四边形
向上翻折,
与
恰好重合,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0819dbe93cc9eac6267f6ca241129e88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97d9daab8504106dcd9b57fb65716f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fe84e078ee81b97c0aeb8cd9fc53c25.png)
![](https://img.xkw.com/dksih/QBM/2016/12/27/1619411074736128/1619411075375104/STEM/c83a9c6e4b444cf9ad7b80d76e8051e0.png)
(1)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ba82a5e20b39279e8dcad34370be490.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03646b740f6e812663e0dfe8925a6884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e453d251928fc8058ceeee602874702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
您最近一年使用:0次
解题方法
2 . 已知一个三棱锥的体积和表面积分别为
,若
,则该三棱锥内切球的表面积为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e7ea8c9d3b95ede8d08f73dee44ea1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd2ddcdeaee694e80c6a0b47cc8cc665.png)
您最近一年使用:0次
2017-02-08更新
|
356次组卷
|
3卷引用:2017届河北磁县一中高三11月月考数学(理)试卷
3 . 已知
,如图,在矩形
中,
分别为
边、
边上一点,且
,现将矩形
沿
折起,使得
,连接
,则所得三棱柱
的侧面积比原矩形
的面积大约多
![](https://img.xkw.com/dksih/QBM/2016/12/27/1619411074736128/1619411074965504/STEM/70824558b05e4acebe17a40315617a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/368763128d1ad0ffad5d859fef834d0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aca479c0adb8b190079681730adbba2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09ff1ab7c0b83696618a8fbea1d2fae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/542362f8147fbdb1e67e1ba8a1b64a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c28d2790a97390935125aa897417f970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a01abf5ae85221309ecf031f2cd872.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2016/12/27/1619411074736128/1619411074965504/STEM/70824558b05e4acebe17a40315617a55.png)
A.68% | B.70% |
C.72% | D.75% |
您最近一年使用:0次
解题方法
4 . 已知某空间几何体的三视图如犹如所示,则该几何体的体积是
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/cf846518-0882-4611-91b5-4a1d48d48890.png?resizew=197)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/cf846518-0882-4611-91b5-4a1d48d48890.png?resizew=197)
A.16 | B.24 | C.32 | D.48 |
您最近一年使用:0次