如图,在半径为
的圆形纸片中,剪一个圆心角为90º的最大扇形(阴影部分),则这个扇形的面积为 ( )
![](https://img.xkw.com/dksih/QBM/2021/5/22/2726662093479936/2727807399550976/STEM/5a73386f-411d-4074-a6f0-28a8f42771b0.png?resizew=121)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2021/5/22/2726662093479936/2727807399550976/STEM/5a73386f-411d-4074-a6f0-28a8f42771b0.png?resizew=121)
A.π | B.![]() | C.2π | D.![]() |
更新时间:2021-05-24 09:21:16
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【知识点】 求扇形面积
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单选题
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适中
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【推荐1】如图,将半径为
的扇形
沿
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,得到扇形
. 若
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A.![]() | B.![]() |
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单选题
|
适中
(0.65)
【推荐2】如图,
,
,
,点E为
的中点,以点C为圆心,
为半径画弧线
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A.![]() | B.![]() | C.![]() | D.![]() |
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