如图,在矩形
中,
,
,以点
为圆心,
长为半径画弧,交边
于点
,连接
,则
的长和扇形
的面积分别为( )
![](https://img.xkw.com/dksih/QBM/2020/11/25/2600428866174976/2604317153976320/STEM/694ef5ec-a727-44cd-9c51-e5da3694d269.png?resizew=171)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0c44512cb86bcf48c6d21357f45b533.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f332555e65843f32f4c623098c6adc72.png)
![](https://img.xkw.com/dksih/QBM/2020/11/25/2600428866174976/2604317153976320/STEM/694ef5ec-a727-44cd-9c51-e5da3694d269.png?resizew=171)
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
20-21九年级上·湖北武汉·期中 查看更多[2]
更新时间:2020-11-30 21:59:43
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【推荐1】如图,在
中,
,
,按以下步骤作图:①以点
为圆心,以任意长为半径作弧,分别交
,
于点
,
;②分别以
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为圆心,以大于![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
的长为半径作弧,两弧在
内交于点
;③作射线
,交
于点
.若点
到
的距离为
,则
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
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【推荐1】如图,在平面直角坐标系中,点A的坐标为
,点C的坐标为
,以
为边作矩形
.动点E,F分别从点O,B同时出发,都以每秒1个单位长度的速度沿
向终点A,C移动.设移动时间为t秒,当四边形
为菱形时,t的值为( )
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【推荐2】如图,矩形
的对角线
相交于点O,点E是
的中点,若
,则BC的长为( )
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【推荐1】如图,圆形挂钟分针针尖到圆心的距离10cm,经20分钟,分针针尖转过的弧长是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/2c6d4255-aa33-4511-98dc-416e2bb65c8a.png?resizew=134)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/2c6d4255-aa33-4511-98dc-416e2bb65c8a.png?resizew=134)
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【推荐2】如图,点C为
的中点,∠ABC=22.5°,AB
,则
的长为( )
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【推荐1】一个扇形的圆心角是120°,半径是3cm,那么这个扇形的面积是( )
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【推荐2】如图,扇形纸扇完全打开后,外侧两竹条AB、AC夹角为120°,AB的长为30cm,贴纸部分BD的长为20cm,则贴纸部分的面积为( )
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