如图,已知正方形的边长为3,如果将线段
绕着点B旋转后,点D落在
的延长线上的
处,则
的长为( )
A.6 | B.![]() | C.18 | D.![]() |
更新时间:2024-03-19 21:07:16
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【推荐1】如图,在矩形
中,
,对角线
与
相交于点
,
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,若
,则
的长是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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A.6 | B.![]() | C.![]() | D.![]() |
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【推荐2】在Rt△ABC中,∠C=90°,若c=10cm,a:b=3:4,则△ABC的周长( )
A.12cm | B.20cm | C.24cm | D.48cm |
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【推荐1】如图,以单位长度为边长作正方形,以原点为圆心,正方形的对角线长为半径画弧,与正半轴的交点
就表示
,与负半轴的交点
就表示
.这种说明问题的方式体现的数学思想方法叫做( )
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A.分类讨论 | B.数形结合 | C.代入法 | D.换元法 |
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【推荐2】如图,正方形
的边长为
,对角线
,
交于点
,
为边
上一点,且
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的长为( )
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,在Rt△ABC中,∠C=90°,∠A=30°,AC=10.将直线CB绕着点C顺时针方向旋转,旋转过程中与边AB交于点D,当旋转15°时,△ACD的面积为( )
![](https://img.xkw.com/dksih/QBM/2021/11/8/2846853585346560/2848473978159104/STEM/f3b79f0b-8e42-4848-b944-69e37bb48295.png)
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A.25 | B.25![]() | C.50 | D.50![]() |
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【推荐2】如图所示,在
中,
,将
绕点A逆时针旋转,使点C落在线段
上的点E处,点B落在点D处,则
两点间的距离为( )
![](https://img.xkw.com/dksih/QBM/2018/4/17/1925621679587328/1929637717762048/STEM/262cc489a09e4df5a40ff81c2b2efe4e.png?resizew=113)
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A.2 | B.![]() | C.![]() | D.![]() |
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