如图①,
为直线
上一点,作射线
,使
,将一个直角三角尺如图摆放,直角顶点在点
处,一条直角边
在射线
上,将图①中的三角尺绕点
以每秒
的速度按顺时针方向旋转(如图②所示),在旋转一周的过程中第
秒时
所在直线恰好平分
,则
的值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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20-21七年级上·江苏扬州·期末 查看更多[4]
江苏省扬州市江都区2020-2021学年七年级上学期期末数学试题河南省驻马店市泌阳县2020-2021学年七年级下学期期末数学试题(已下线)专题3.10 旋转-几何变换(提升篇)(专项练习)-2020-2021学年八年级数学下册基础知识专项讲练(北师大版)江苏省盐城市景山中学2021-2022学年七年级上学期第二次课堂检测数学试题
更新时间:2021-01-27 13:13:00
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【推荐1】如图①,是边长为的正方形纸板,裁掉阴影部分后折叠成如图②所示的长方体盒子,已知该长方体宽是高的2倍,则它的体积是
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【推荐2】一条数轴上有点
、
、
,其中点
、
表示的数分别是
、
,现以点
为折点,将数轴向右对折,若点
对应的点
落在点
的右边,并且
,则
点表示的数是________ .
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【推荐1】如图,点
为直线
上一点,过点
作射线
,使
,将一个含
角的直角三角板的一个顶点在点
处,斜边
与直线
重合,另外两条直角边都在直线
的下方,将图中的三角板绕点
按每秒
的速度沿逆时针方向旋转一周,当直线
恰好平分锐角
时,则时间
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【推荐2】如图,已知长方形纸片
中,点E、F、G分别在边
上,将三角形
沿
翻折,点A落在点
处,将三角形
沿
翻折,点D落在点
处.有以下四个结论:①若
,则
;②若
,则
、
、E三点不一定在同一直线上;③若
,则
;④若
,则
.其中正确的结论有______
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【推荐1】如图,菱形
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【推荐2】如图,点
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边
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