如图所示的几何体,其中底面ABCD是以CD为高的直角梯形,∠ADC=90°,AD=CD=1,BC=2,SA⊥底面ABCD,连接SC,SB,SD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/45e6c9a5-eb70-41e1-8126-6a54b5da3a4e.png?resizew=156)
(1)求二面角B-SA-D的角度
(2)若SA=a,求面SAB与面SDC所成角的余弦值与a的关系,并求出余弦值的取值范围
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/45e6c9a5-eb70-41e1-8126-6a54b5da3a4e.png?resizew=156)
(1)求二面角B-SA-D的角度
(2)若SA=a,求面SAB与面SDC所成角的余弦值与a的关系,并求出余弦值的取值范围
2021·浙江·模拟预测 查看更多[2]
更新时间:2021-06-28 22:09:39
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适中
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【推荐1】如图,在三棱锥
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(Ⅱ)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
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真题
【推荐2】如图,在五面体
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解答题-证明题
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适中
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【推荐3】在矩形
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适中
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解题方法
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解答题-证明题
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适中
(0.65)
【推荐3】如图,在正方体
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与平面
所成角的正弦值为
,求平面
与平面
所成锐二面角的余弦值.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
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(1)若E为棱
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(2)若直线
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