圆心角为90°的扇形如图所示,过
的中点作CD⊥OA、CE⊥OB,垂足分别为点D、E.若半径OA=2,则图中阴影部分图形的面积和为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/a2d88c81-df26-473d-988f-a6fffddaee0d.png?resizew=142)
更新时间:2021-01-18 08:30:06
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