要制作一个圆锥形的铁皮烟囱帽,使圆锥的高与母线长的比是4:5,那么所需扇形铁皮的圆心角度数是______ 度
更新时间:2017-10-12 12:26:45
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【推荐1】已知半径为2的⊙O中,弦AC=2,弦AD=
,则∠AOD=________ ,∠COD=_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
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【推荐2】如图,
是
的直径,弦
连接
并延长交
于点
连接
交
于点
若
则
的度数是________________ .
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