名校
解题方法
1 . 如图,在三棱锥
中,
和
均为边长为2的等边三角形.
![](https://img.xkw.com/dksih/QBM/2022/5/24/2986464517988352/2987777438982144/STEM/f818fd13-387c-47a3-9d79-ec3ba8687163.png?resizew=215)
(1)证明:
.
(2)若
与平面
所成的角为
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2022/5/24/2986464517988352/2987777438982144/STEM/f818fd13-387c-47a3-9d79-ec3ba8687163.png?resizew=215)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
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2022-05-26更新
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5卷引用:山西省忻州市第一中学校2022届高三下学期5月模拟文科数学试题