如图,A、O在网格中小正方形的顶点处,每个小方格的边长为1,在此网格中找两个格点(即小正方形的顶点)B、C,使O为
的外心,则
的长度是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
A.![]() | B.![]() | C.4 | D.![]() |
2024·江苏镇江·一模 查看更多[3]
更新时间:2024-06-16 21:27:57
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【推荐1】如图所示,边长为1的小正方形构成的网格中,半径为1的
的圆心
在格点上,则
的余弦值等于( )
![](https://img.xkw.com/dksih/QBM/2020/10/7/2566053197905920/2566662196862977/STEM/f815a053-b79c-4e7e-bd0f-1ad9ba402048.png)
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A.![]() | B.![]() | C.2 | D.![]() |
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【推荐2】如图,在正方形网格内,A、B、C、D四点都在小方格的格点上,则
( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/fe3b0048-1fe4-4a7a-8255-6148719765f7.png?resizew=147)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15f675175e59f472154b399948ef339.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/fe3b0048-1fe4-4a7a-8255-6148719765f7.png?resizew=147)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,已知
是
的外心,
,
分别是
,
的中点,连接
,
,分别交
于点
,
.若
,
,
,则
的面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/6bd245ec-03e7-4080-abe0-91d11c6d4915.png?resizew=172)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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A.72 | B.96 | C.120 | D.144 |
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【推荐2】已知△ABC的外心为O,连结BO,若∠OBA=18°,则∠C的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/3a4cf0ac-ed6e-48b9-8a33-41310da4c6a5.png?resizew=136)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/3a4cf0ac-ed6e-48b9-8a33-41310da4c6a5.png?resizew=136)
A.60° | B.68° | C.70° | D.72° |
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