正四面体的侧棱与底面所成角的正弦值是( )
A.![]() | B.![]() | C.![]() | D.![]() |
22-23高一·全国·课后作业 查看更多[5]
沪教版(2020) 必修第三册 高效课堂 第十一章 11.2锥体(1)(已下线)8.6.2 直线与平面垂直(精讲)(已下线)13.2.3 直线与平面的位置关系(已下线)13.2.3 直线和平面的位置关系(1)(已下线)核心考点08空间直线、平面的垂直-【满分全攻略】2022-2023学年高一数学下学期核心考点+重难点讲练与测试(人教A版2019必修第二册)
更新时间:2023-02-06 23:50:27
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【知识点】 求线面角
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【推荐1】将地球看作一个以O为球心的球体,地球上点P的纬度是指OP与赤道面所成角的度数.一个地球仪,在其北半球某纬线圈上有A,B,C三点,其中AB=2,
,∠ABC=60°,且三棱锥
的体积为
,则这个纬线圈的纬度为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1f4f255d191786f7d330d278868c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4278c0911e7df78965e78cff69cac5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f83dbfddc6f98548699ed581e8c8608.png)
A.30° | B.45° | C.60° | D.75° |
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【推荐2】如图,在边长为2的正方形
中,
,
分别为
,
的中点,
为
的中点,沿
,
,
将正方形折起,使
,
,
重合于点
,在构成的三棱锥
中,下列结论错误 的是
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/f889244e-fbd4-4a8b-a6d9-eee90a65a307.png?resizew=311)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a477603f3f88c3b48352b6130f9ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03e76557eb459ed6fec296b1f9889b58.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/f889244e-fbd4-4a8b-a6d9-eee90a65a307.png?resizew=311)
A.![]() ![]() |
B.三棱锥![]() ![]() |
C.直线![]() ![]() ![]() |
D.异面直线![]() ![]() ![]() |
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