古代文人墨客与丹青手都善于在纸扇上题字题画,题字题画的部分多为扇环、已知某扇形的扇环如图所示,其中外弧线的长为48cm,内弧线的长为16cm,连接外弧与内弧的两端的线段均为20cm,则该扇形的中心角的弧度数为____________ .
![](https://img.xkw.com/dksih/QBM/2023/1/12/3151354536427520/3152160956989440/STEM/e6d476e201e94ecaa70d72b38d66969a.png?resizew=238)
更新时间:2023-01-13 22:30:47
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【推荐2】某扇形的圆心角为2弧度,周长为4cm,则该扇形面积为_____ cm2.
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