1 . 如图,已知扇环的内弧长为
,外弧长为
,扇环的宽为3,将该扇环卷成圆台,则该圆台的高为( )
![](https://img.xkw.com/dksih/QBM/2021/4/9/2695858881388544/2800785592475648/STEM/249f19dd-40c0-43d1-90fa-4a4593c0a115.png?resizew=259)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e9fdc1f8ed0ae44b54a9a2a3aca2db4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9609625b502348556ff8ba32deac8caa.png)
![](https://img.xkw.com/dksih/QBM/2021/4/9/2695858881388544/2800785592475648/STEM/249f19dd-40c0-43d1-90fa-4a4593c0a115.png?resizew=259)
A.![]() | B.3 | C.![]() | D.![]() |
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