如图,
是半圆
的一条弦,以弦
为折线将弧
折叠后过圆心
,
的半径为
,则圆中阴影部分的面积为( )
![](https://img.xkw.com/dksih/QBM/2023/4/1/3207333744197632/3214151413342208/STEM/d18a31daafa2466ea02b1145865acb5e.png?resizew=171)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://img.xkw.com/dksih/QBM/2023/4/1/3207333744197632/3214151413342208/STEM/d18a31daafa2466ea02b1145865acb5e.png?resizew=171)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-04-11 12:30:42
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【推荐1】如图,以
的顶点O为圆心,适当长为半径画弧,分别交OA,OB于点C.D,再分别以点C,D为圆心,以大于
的长为半径画弧,两弧在
内部交于点E,过点E作射线OE,点P是射线OE上任意一点,连接CD,CP,DP.有下列说法:
①射线OE是
的平分线;②
是等腰三角形;③
是等边三角形:④C,D两点关于OE所在直线对称;⑤线段CD所在直线是线段OP的垂直平分线;⑥图中有5对全等三角形.其中正确结论的个数是( )
![](https://img.xkw.com/dksih/QBM/2022/2/25/2924032287637504/2939614059347968/STEM/ebb0f08a-8feb-4596-bdd5-7404f31e1048.png?resizew=193)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b840be5852709e18ea985954545e78d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
①射线OE是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc6b0f69ed7e3633248f6b1c093e874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
![](https://img.xkw.com/dksih/QBM/2022/2/25/2924032287637504/2939614059347968/STEM/ebb0f08a-8feb-4596-bdd5-7404f31e1048.png?resizew=193)
A.5 | B.4 | C.3 | D.2 |
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【推荐2】如图,菱形
的对角线
、
相交于点O,过点D作
于点H,若
,则菱形
的面积是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a7cf70f8772d8fea4599b18df2c88f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89f7d3eb7e40b3525fd35543be2324b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/dd603e55-282c-4d89-afe5-51e9dd210cd0.png?resizew=196)
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【推荐1】如图,将半径为2cm的圆形纸片翻折,使得
、
恰好都经过圆心O,折痕为AB、BC,则阴影部分的面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/549115a2-7e34-4f26-adec-546b970b576c.png?resizew=159)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/549115a2-7e34-4f26-adec-546b970b576c.png?resizew=159)
A.![]() | B.πcm2 | C.![]() | D.![]() |
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名校
【推荐2】如图,已知
,
,
,点C在线段
上,
.将
绕点B按顺时针方向旋转
,使得
与
重合,则线段
所扫过的面积(即阴影部分面积)为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/0947dde7-15b8-4a33-b5fd-8bdadd5921fa.png?resizew=153)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8afa43db94e04d06203870fa1a5b9a74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31fc416061545b4d18c4858113230fd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aabecf66d94e4094f9cc46fd8ee050f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/0947dde7-15b8-4a33-b5fd-8bdadd5921fa.png?resizew=153)
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【推荐1】如图1,小强拿一张正方形的纸,沿虚线对折一次得图2,再对折一次得图3,然后用剪刀沿图3中的虚线剪去一个角,再打开后的形状是 ( )
![](https://img.xkw.com/dksih/QBM/2016/2/18/1573972225515520/1573972231438336/STEM/b7674babe92e4fbcb67f8411409ba522.png?resizew=247)
![](https://img.xkw.com/dksih/QBM/2016/2/18/1573972225515520/1573972231438336/STEM/b7674babe92e4fbcb67f8411409ba522.png?resizew=247)
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【推荐2】如图,将▱
纸片折叠
折痕为
,使点
落在
上,记作
;展平后再将▱
折叠
折痕为
,使点
落在
上,记作
;展平后继续折叠▱
,使
落在直线
上,记作
;重新展平,记作
若
,
,则图
中线段
的长度为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/18/d1716caf-b50c-4718-a5b6-def846a3b037.png?resizew=505)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cf2b1e12b5d7341b2cd2cbc6bbea618.png)
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