如图,以AB为直径的半圆圆心为O,AB=10,折叠半圆使点A,点B都与圆心O重合,折痕分别为CD,EF,连接DF,则图中阴影的面积为( )
![](https://img.xkw.com/dksih/QBM/2021/5/6/2715145476063232/2717104138682368/STEM/cc489191-ab09-4b59-a2e1-86cbb5d16832.png)
![](https://img.xkw.com/dksih/QBM/2021/5/6/2715145476063232/2717104138682368/STEM/cc489191-ab09-4b59-a2e1-86cbb5d16832.png)
A.![]() | B.![]() | C.![]() | D.![]() |
2021·山西吕梁·二模 查看更多[2]
更新时间:2021-05-23 07:47:03
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【推荐1】如图,
三点在同一直线上,
都是等边三角形,
与
交于点
,
与
交于点
,
与
交于点
,连接
,①
;②
平分
;③
;④
;⑤
,下列结论中正确的个数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/d4523615-5d5c-4482-838c-94a91694455c.png?resizew=264)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02ff30509b121897e5303a3c2477b629.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a92d63112cf50a7553de0c34149ffdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7341c7d3b742bf451457145206782711.png)
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A.2个 | B.3个 | C.4个 | D.5个 |
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【推荐2】已知P是等边三角形
的边
上的一点,若
,则在以线段
,
,
为边的三角形中,则最小内角的度数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/346adbdcefc785c69437996020b3c5bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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【推荐1】如图,在矩形
中,对角线
,
相交于点
,
,
,点
在线段
上从点
至点
运动,连接
,以
为边作等边三角形
,点
和点
分别位于
两侧,下列结论:①
;②
;③
;④点
运动的路程是
,其中正确结论的序号为( )
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A.①②③ | B.①③④ | C.②③④ | D.①②③④ |
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【推荐2】如图,已知△ABC中,
,
,边
的垂直平分线
交
于点O,以
为半径的
交
于点D,则
的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/fba3c56a-5d2a-4c10-94ea-3f6f9c09f2e6.png?resizew=222)
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您最近一年使用:0次
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【推荐1】如图,矩形ABCD中,
,点E是AD上的一点,且
,CE的垂直平分线交CB的延长线于点F,交CD于点H,连接EF交AB于点G.若G是AB的中点,则BC的长是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/346f787d-dbfe-4873-a8c8-4460bef481b6.png?resizew=190)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a19338598965bb3856cdd0236bbf694.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/346f787d-dbfe-4873-a8c8-4460bef481b6.png?resizew=190)
A.6 | B.7 | C.8 | D.10.5 |
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【推荐2】如图,射线
都垂直于线段
,E为
上一动点,
于点F,交
于点C,
于点D,设
,设
时,k的值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/3769737e-62b6-4e91-a272-935c1cf38342.png?resizew=243)
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A.1 | B.![]() | C.![]() | D.不存在 |
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【推荐1】如图,在矩形
中,E是边
上一点,
,连接
,取
中点O,以点O为圆心,
长为半径作半圆,恰与
边相切于点F,并交
边于点G.已知
,则图中阴影部分的面积是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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真题
【推荐2】如图,菱形ABCD的边长为2,∠A=60°,以点B为圆心的圆与AD、DC相切,与AB、CB的延长线分别相交于点E、F,则图中阴影部分的面积为( )
![](https://img.xkw.com/dksih/QBM/2015/9/1/1573908679540736/1573908685856768/STEM/31bdc33e37d54efa96013f78926e1536.png?resizew=148)
![](https://img.xkw.com/dksih/QBM/2015/9/1/1573908679540736/1573908685856768/STEM/31bdc33e37d54efa96013f78926e1536.png?resizew=148)
A.![]() | B.![]() | C.![]() | D.![]() |
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