如图,圆台O1O2的轴截面为等腰梯形A1A2B2B1,A1A2
B1B2,A1A2=2B1B2,A1B1=2,圆台O1O2的侧面积为6π.若点C,D分别为圆O1,O2上的动点且点C,D在平面A1A2B2B1的同侧.
![](https://img.xkw.com/dksih/QBM/2020/4/8/2436881370873856/2437602494111744/STEM/0d409acf-6f0f-486a-920a-669f582a526e.png)
(1)求证:A1C⊥A2C;
(2)若∠B1B2C=60°,则当三棱锥C﹣A1DA2的体积取最大值时,求A1D与平面CA1A2所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://img.xkw.com/dksih/QBM/2020/4/8/2436881370873856/2437602494111744/STEM/0d409acf-6f0f-486a-920a-669f582a526e.png)
(1)求证:A1C⊥A2C;
(2)若∠B1B2C=60°,则当三棱锥C﹣A1DA2的体积取最大值时,求A1D与平面CA1A2所成角的正弦值.
更新时间:2020-04-09 08:57:52
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【知识点】 线面角的向量求法
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解答题-证明题
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适中
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名校
【推荐1】三棱柱
中,平面
平面
,
,
,
,点F为棱
的中点,点E为线段
上的动点.
![](https://img.xkw.com/dksih/QBM/2020/7/9/2502366403821568/2503719401316352/STEM/be7b75eefeb646d88f4f443714e24314.png?resizew=175)
(1)求证:
;
(2)若直线
与平面
所成角的正弦值为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac4fb99967c46a3855bcf2885b448c3.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61f6eb7e9850bbf861dccaee95a05ae9.png)
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解答题-问答题
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适中
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【推荐2】如图,圆柱
的底面半径与高均为2,AB为
的直径,
分别为
,
上的点,直线CD与线段
交于O点.
(1)证明:O为线段
的中点;
(2)若AC与下底面所成的角为
,求直线BC与平面ACD所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
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(1)证明:O为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
(2)若AC与下底面所成的角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037fb348109dc2063a268b10eb925a57.png)
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