如图所示的图形叫弧三角形,又叫莱洛三角形,是机械学家莱洛首先进行研究的.弧三角形是这样画:先画正三角形
,然后分别以点A,B,C为圆心,
长为半径画弧.若一个弧三角形的周长为
,则此弧三角形的面积是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e9fdc1f8ed0ae44b54a9a2a3aca2db4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/8fbf4c89-40c7-4f0d-9984-84265288a938.png?resizew=151)
A.![]() | B.![]() | C.![]() | D.![]() |
2023·浙江丽水·一模 查看更多[3]
2023年浙江省丽水市庆元县中考一模数学试题(已下线)第07讲 弧长、扇形面积和圆锥的侧面积(知识解读+真题演练+课后巩固)-2023-2024学年九年级数学上册《知识解读·题型专练》(苏科版)(已下线)第07讲 弧长、扇形面积和圆锥的侧面积(知识解读+真题演练+课后巩固)-2023-2024学年九年级数学上册《知识解读·题型专练》(人教版)
更新时间:2023-05-22 15:30:44
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【推荐1】如图,在
中,
,以点B为圆心,
长为半径画弧,交边
于点D,则
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】如图,在△ABC中,∠ACB=90°,AC=BC,AB=4cm,CD是中线,点E、F同时从点D出发,以相同的速度分别沿DC、DB方向移动,当点E到达点C时,运动停止,直线AE分别与CF、BC相交于G、H,则在点E、F移动过程中,点G移动路线的长度为( )
![](https://img.xkw.com/dksih/QBM/2021/9/28/2817896444264448/2818321997488128/STEM/e0a1b1a30eca4015943b62f353194fe0.png?resizew=208)
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【推荐1】如图所示,边长为1的正方形网格中,
、
、
、
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是网格线交点,若
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【推荐2】如图,在
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于点
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为圆心,边
长为半径作
交边
于点
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