如图,正三角形
的边长为
,则它的外接圆
的半径为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd6f4250ca6b1b9bce234a01f00d44d.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
2024·四川泸州·一模 查看更多[4]
2024年四川省泸州市泸县第一次学业水平模拟考试数学模拟试题2024年四川省泸州市泸县中考数学一模试题(已下线)重难点04+圆的基本性质及直线与圆的位置关系(11大题型+满分技巧+限时分层检测)22024年内蒙古呼伦贝尔市阿荣旗九年级下学期中考二模数学试题
更新时间:2024-03-16 08:29:17
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【推荐1】如果三角形内有一点到三边距离相等,且到三顶点的距离也相等,那么这个三角形的形状是( )
A.等腰三角形 | B.直角三角形 |
C.等腰直角三角形 | D.等边三角形 |
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【推荐2】如图,C为线段
上一动点(不与A,D重合),在
同侧分别作正三角形
和正三角形
,
与
交于点O,
与
交于点P,
与
交于点Q,连接
,以下五个结论:①
;②
;③
;④
;⑤
.其中完全正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/22/09d8a602-c2ea-4faa-a89b-cd6e6cf08870.png?resizew=155)
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【推荐1】如图是某品牌的香水瓶.从正面看上去它可以近似看作
割去两个弓形后余下的部分,与矩形
组合而成的图形(点
,
在
上),其中
;已知
的半径为25,
,
,
,则香水瓶的高度
是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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A.56 | B.57 | C.58 | D.59 |
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【推荐2】如图所示,弦CD垂直于⊙O的直径AB,垂足为E,且CD=
,BD=
,则AB的长为 ( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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C.4 | D.5 |
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【推荐1】如图,点
、
、
是
上的点,
,则
的度数为是( )
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【推荐2】如图,以AD为直径的半圆O经过Rt△ABC斜边AB的两个端点,交直角边AC于点E;B、E是半圆弧的三等分点,
的长为
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【推荐1】如图,已知正方形ABCD的边长为1,若将边BC绕点B旋转90°后,得到正方形BC′D′C,连接AC、AD′,设∠BAC=α, ∠C′AD′=β,那么sinα+sinβ等于( )
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【推荐2】如图,在
中,
,
,
,
与y轴的夹角为
,按如下方式操作:第一次,将
绕点О顺时针旋转
,得到
;第二次,将
,沿y轴翻折,得到
;第三次,将
绕点О顺时针旋转
,得到
;第四次,将
沿y轴翻折,得到
……则第2024次操作结束后,
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