如图,在扇形AOB中,∠AOB=90°,OA=2 ,C是OA的中点,CE⊥OA交
于点E,以点O为圆心,以OC为半径作
交OB于点D,则图中阴影部分的面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/d763a67e-de26-4f62-8ca0-191a40c7d6ed.png?resizew=175)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/d763a67e-de26-4f62-8ca0-191a40c7d6ed.png?resizew=175)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2022-04-05 23:16:16
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【推荐1】如图,分别以
的边
,
所在直线为对称轴作
的对称图形
和
,
,线段
与
相交于点
,连接
、
、
、
.有如下结论:①
;②
;③
平分
;④
.其中正确的结论个数是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/27338bf4-af1c-4a9d-81f3-ba9a0269aa4f.png?resizew=227)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c786b48d3aff4d2f73f83cc1a32a094a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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A.1 | B.2 | C.3 | D.4 |
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【推荐2】等腰△ABC中,AB=AC,∠BAC=120°,AD⊥BC于D,点P是BA延长线上一点,点O是线段AD上一点,OP=OC,以下结论:①∠APO=∠DCO; ②∠APO+∠DCO=30°;③△OPC为等边三角形;④AC=AD+AP;⑤
. 其中正确的有( )
![](https://img.xkw.com/dksih/QBM/2017/5/3/1678839236083712/1684926342750208/STEM/b9f94c588bf74376bd9e6958791c8d9e.png?resizew=176)
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A.2个 | B.3个 | C.4个 | D.5个 |
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【推荐1】如图所示的网格中小正方形的边长均为1,点A,B均在格点上,点C是以
为直径的圆与网格线的交点,O为圆心,点D是
的中点,
,则图中阴影部分的的面积为( )(用含
的式子表示)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/79b2aae5-5cd1-4b9e-a5c6-701b5ce3a4ec.png?resizew=173)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,AB是⊙O的直径,弦CD⊥A,∠CDB=300,CD=
,则阴影部分图形的面积为( )
![](https://img.xkw.com/dksih/QBM/2012/7/26/1573470187560960/1573470263943168/STEM/6463af28cc80439ab1c4aca20edea51f.png?resizew=153)
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A.![]() | B.3π | C.π | D.![]() |
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【推荐1】如图,
是矩形
对角线,
,
,以
为圆心、
的长为半径作弧,交
于
,交
于
;再分别以
,
为圆心、大于
的长为半径作弧,两弧在
内交于点
,作射线
交
于点
,则下列说法错误的是( )
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A.![]() | B.![]() |
C.点![]() ![]() ![]() | D.图中阴影部分面积为![]() |
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【推荐2】如图,扇形中,
,点
为
的中点,将扇形
绕点
顺时针旋转,点
的对应点为
,连接
,当
时,阴影部分的面积为( )
A.![]() | B. ![]() | C. ![]() | D. ![]() |
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