某仿古墙上原有一个矩形的门洞,现要将它改为一个圆弧形的门洞,圆弧所在的圆外接于矩形门,如图.已知矩形的宽为
,对角线为
,则改建后门洞的圆弧长是( )m
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99e3cc7c707cfd4e8e26df1c69076638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff47258bb60823c4d84ce19503c96a56.png)
A.![]() | B.![]() | C.![]() | D.![]() |
2024·安徽合肥·二模 查看更多[1]
更新时间:2024-06-06 08:26:00
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【推荐1】
平分锐角
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,
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【推荐2】如图,∆ABC中,∠A=60°,CD=BE,点M,N,E分别为BD,CE,AB的中点,若MN=
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【推荐1】矩形ABCD中,已知AB=5,AD=12,则AC长为( )
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【推荐2】如图,O是矩形ABCD的对角线AC的中点,M是AD的中点,若AB=5,AD=12,则四边形ABOM的周长为( )
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【推荐1】如图,在单位长度为1米的平面直角坐标系中,曲线是由半径为2米,圆心角为
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【推荐2】我们把1,1,2,3,5,8,13,21,…这组数称为斐波那契数列,为了进一步研究,依次以这列数为半径作90°圆弧
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