解答题-问答题 适中0.65 引用1 组卷613
如图,将一副三角板拼接,使他们有公共边BC,且使这两个三角形所在的平面互相垂直,
,
,
,BC=6.
![](https://img.xkw.com/dksih/QBM/2015/3/27/1572038944489472/1572038950412288/STEM/96a8136be5af4ca6a8bd5eadf0226c49.png)
(1)证明:平面ADC^平面ADB;
(2)求二面角A—CD—B平面角的正切值.
![](https://img.xkw.com/dksih/QBM/2015/3/27/1572038944489472/1572038950412288/STEM/2fba3a81b1304aa19ceb1462f433fe62.png)
![](https://img.xkw.com/dksih/QBM/2015/3/27/1572038944489472/1572038950412288/STEM/8868b3118e0a42a78f9bcf4ca95a1ac9.png)
![](https://img.xkw.com/dksih/QBM/2015/3/27/1572038944489472/1572038950412288/STEM/96a8136be5af4ca6a8bd5eadf0226c49.png)
(1)证明:平面ADC^平面ADB;
(2)求二面角A—CD—B平面角的正切值.
2015·广东肇庆·二模
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