如图,半径为2的扇形AOB的圆心角为120°,点C是弧AB的中点,点D、E是半径OA、OB上的动点,且满足∠DCE=60°,则图中阴影部分面积等于___________ .
![](https://img.xkw.com/dksih/QBM/2022/1/10/2891606528991232/2892808988778496/STEM/04bf9e00-ab65-462e-ae67-54dce0a42a1f.png?resizew=213)
更新时间:2022-01-12 12:17:51
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【推荐1】如图,正方形ABCD中,点G在AB,连接DG,点H在AD上,点K在BC上,HK⊥DG于点F,连接AF、GH,AF的延长线交CD于点E,DF=DE,GH=5,BK=7,则AF的长为______ .
![](https://img.xkw.com/dksih/QBM/2022/4/24/2964937203769344/2967012690624512/STEM/e796d5a9-d5c5-4891-99f4-195dbcbf1462.png?resizew=159)
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【推荐2】如图,在
中,
是
的中点,作
于点
,连接
,
,则下列结论中一定成立的是___________ .(把所有正确结论的序号都填在横线上)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/7/af5b086b-e88c-436a-980f-8c4a0959f083.png?resizew=201)
①
;
②
;
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;
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①
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②
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③
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④
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【推荐1】如图,⊙O的直径AB垂直于弦CD,垂足为E.如果∠B=60°,AC=6,那么CD的长为______ .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/6/74357b87-3e59-4f02-8edb-1a7f3e890595.png?resizew=131)
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【推荐2】如图,点E、F分别是菱形
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上的点,且
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______
.
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【推荐1】如图,在
中,
,
,
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的长为半径画弧,分别交
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为圆心,
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【推荐2】如图,AB是⊙O的直径,弦CD⊥AB于点E,OE=1,CD=
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【推荐1】如图,正方形ABCD的边长为2,O为对角线的交点,E、F分别为BC、CD的中点,以C为圆心,2为半径作
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【推荐2】如图,分别以等边三角形ABC的三个顶点为圆心,以边长为半径画弧,得到的封闭图形是莱洛三角形,若AB=2,则莱洛三角形的面积(即阴影部分面积)为_______ .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/643c7c2f-6b70-4b04-8317-cebf5dd25fec.png?resizew=133)
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