兰州市新开的滑冰馆备受年轻人的喜欢,此馆的平面设计如图所示,其中区域
为休息区,
,
,区域
为滑冰区,
.现为了安全起见,将滑冰区周围筑起护栏.若
,求护栏的长度(
的周长).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597601cb00ba7cc26022b158390ced9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99f2f1eb2beb23690f56a68dc7da08cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e90dd13e9804010653b6dae413ad3d8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d399eef6eee6ce110d4abf939c742297.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/2/50c76142-62f5-40d4-8154-5d6c124216c9.png?resizew=139)
更新时间:2023-05-31 15:38:48
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【推荐1】一架飞机从A地飞到B地,两地相距
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【推荐2】某渔轮在航行中不幸遇险,发出呼救信号,我海军舰艇在A处获悉后,立即测出该渔轮在方位角为45°,距离为10mile的C处,并测得渔轮正沿方位角为105°的方向,以
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