图1为一艺术拱门,下部为矩形ABCD,AB、AD的长分别为
m和4m,上部是圆心为O的劣弧CD,∠COD=120°.现欲以点B为支点将拱门放倒,放倒过程中矩形ABCD所在的平面始终与地面垂直,如图2所示.设BC与地面水平线所成的角为
,记拱门上的点到地面的距离为h,当h取最大值时,此时
为________ °.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/22/b3e74809-b663-4133-99b4-f7ae45bbd2f9.png?resizew=224)
2020·江苏泰州·模拟预测 查看更多[2]
更新时间:2020-06-01 23:42:09
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【推荐2】如图,点O为原点,⊙O的半径为1,点A的坐标为(2,0),动点B在⊙O上,以AB为边作等边△ABC(顺时针),则线段OC的最小值为_____ .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/27/a5d1adbf-326b-4ff8-9a37-88350ecf4496.png?resizew=289)
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【推荐1】在
中,
,
,O为
边的中点,将
绕着点O旋转
得到线段
,连接
,当
为等腰三角形时,
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
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【推荐2】如图,在
中,
,点D为
边上一动点,连接
,将线段
绕点A顺时针旋转
,且
,得到线段
,连接
,其中
交
于点F,当
为直角三角形时,
的长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】如图1是某激光黑白A4纸张打印机的机身,其侧面示意图如图2,
,
.出纸盘EP下方为一段以O为圆心的圆弧
,与上部面板线段AE相接于点E,与CD相切于点D.测得
,
.进纸盘CH可以随调节扣HF向右平移,
,
.当HF向右移动6cm至
时,点A,D,
在同一直线上,则AB的长度为______ cm.若点E到AB的距离为16cm,
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______ cm.
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【推荐2】如图,公园里有一灯杆
垂直水平地面
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【推荐1】如图,矩形ABCD的边CD上有一点E,
,
,垂足为F,将
绕着点F顺时针旋转,使得点A的对应点M落在EF上,点E恰好落在点B处,连接BE.下列结论:①
;②四边形EFBC是正方形;③
;④
,其中结论正确的为______ .(填写序号即可)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6fd230a035f5b91abd7390b77138f18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
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![](https://img.xkw.com/dksih/QBM/2021/11/17/2853326565801984/2863222341033984/STEM/7155b8d8-a686-4054-8697-e16b073f2aba.png?resizew=196)
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【推荐2】如图,在矩形ABCD中,BC=2AB,点P为边AD上的一个动点,线段BP绕点B顺时针旋转60°得到线段BP',连接PP' ,CP'.当点P' 落在边BC上时,∠PP'C的度数为________ ; 当线段CP' 的长度最小时,∠PP'C的度数为________
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/21/d5702f64-db9f-4e48-b8cd-5b883e9a259b.png?resizew=204)
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