如图,把一个圆分成了四个扇形,已知圆的半径为
,求扇形甲与扇形丙的面积之和.(结果保留
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd6f4250ca6b1b9bce234a01f00d44d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/b4735369-7ce5-4b52-97de-6e959a3ae520.png?resizew=115)
更新时间:2023-12-25 08:25:38
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【知识点】 求扇形面积
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解答题-作图题
|
较易
(0.85)
【推荐1】如图,已知
三个顶点的坐标分别是
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/97da4c09-980a-4d2c-b0a4-28687b8d9652.png?resizew=202)
(1)画出
绕点B逆时针旋转90°所得到的
,
(2)直接写出点
,
的坐标.
(3)线段
扫过的面积是___________(结果保留π)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5e50a73238fca0020612816c2972599.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/97da4c09-980a-4d2c-b0a4-28687b8d9652.png?resizew=202)
(1)画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bcc65bfd96beeb5f6a788d47ccdcf16.png)
(2)直接写出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/035a5a88e7e2d6ef2b47d992412a1f2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afb6101e45f8d7013bc3dc4197188c0c.png)
(3)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
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解答题-问答题
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较易
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【推荐2】小刚用一张半径为12cm的扇形纸板做一个如图所示的圆锥形小丑帽子侧面(接缝忽略不计),如果做成的圆锥形小丑帽子的底面半径为5cm,那么这张扇形纸板的面积是多少cm
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://img.xkw.com/dksih/QBM/2015/9/29/1573918493024256/1573918499348480/STEM/831d77f8c6ed463f967ee336e7a72f99.png?resizew=217)
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