如图,C是半圆O上一点,
是半圆O的直径,
,D是垂足,
,以
为直径作半圆,则图中阴影部分的面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/22/1e31e8d5-85a0-43ec-ae91-b39b61bedbc7.png?resizew=207)
A.![]() | B.![]() | C.![]() | D. ![]() |
更新时间:2023-10-22 16:07:17
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【推荐1】如图,把半径为3的⊙O沿弦AB,AC折叠,使
和
都经过圆心O,则阴影部分的面积为( ).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/21/ee815c06-226a-4dd5-a391-b54017591647.png?resizew=148)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/21/ee815c06-226a-4dd5-a391-b54017591647.png?resizew=148)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,等边△ABC内接于⊙O,D是
上任一点(不与B、C重合),连接BD、CD,AD交BC于E,CF切⊙O于点C,AF⊥CF交⊙O于点G.下列结论:①∠ADC=60°;②DB2=DE•DA;③若AD=2,则四边形ABDC的面积为
;④若CF=2
,则图中阴影部分的面积为
.正确的个数为( )
![](https://img.xkw.com/dksih/QBM/2022/1/7/2889217838243840/2889945731039232/STEM/effc8229-55a1-4fe4-8b35-1cf3f68c8d54.png?resizew=312)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2b34fbfbe30bea03ef04ee293d8368.png)
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A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】如图,对折矩形纸片ABCD,使AD与BC重合,得到折痕EF,把纸片展平后再次折叠,使点A落在EF上的点A' 处,得到折痕BM,且BM与EF相交于点N,若直线BA'交直线CD于点O,BC =
,EN =
,则OD的长为( )
![](https://img.xkw.com/dksih/QBM/2021/2/4/2650412041265152/2652252766846976/STEM/6ea59b49-77fc-4c79-8c95-5221e5e75097.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa37aefb6d45efe4e20ba48c2e7dfa8.png)
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A.![]() | B.1 | C.![]() | D.![]() |
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【推荐2】如图,在平面直角坐标系中,点A在函数
的图象上,连结OA,过点A作AB平行于x轴,点B在点A的右侧,连结OB交该函数图象于点C,连结AC.若
,且
的面积为
,则k的值为( )
![](https://img.xkw.com/dksih/QBM/2021/6/11/2740679040139264/2740953026183168/STEM/8f9c55db-deab-43ec-afca-b60474414021.png)
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