在直角
中,
,圆O经过A、B、D三点,
的延长线交圆O于点E,过点A作圆O的切线,交
的延长线于点F,若
,则
为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/80a620c5-d545-4e8b-b423-d5999fef2b6f.png?resizew=146)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b310404b54fad737e1218bf8589f18be.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fd9558de36371fb8680801d1bbaa9f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2acc3d97d68adaa0869cb814b5d76337.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/80a620c5-d545-4e8b-b423-d5999fef2b6f.png?resizew=146)
A.![]() | B.![]() | C.![]() | D.![]() |
18-19九年级下·浙江杭州·期中 查看更多[1]
(已下线)【新东方】 初中数学945【2019年】【初三下】
更新时间:2021-01-28 16:17:41
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【推荐1】如图,在边长相同的小正方形网格中,点A、B、C、D都在这些小正方形的顶点上,
相交于点P,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdcf86f7cf381c563ad80af86feeed83.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/16/cddf76ef-33ce-4783-9b7f-eb577c202dfc.png?resizew=133)
A.3 | B.![]() | C.1 | D.2 |
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【推荐2】如图是一个装置的示意图,其中圆形吊舱初始位置与水平横杆
、卡槽
相切.水平横杆
米,
米,吊舱半径为10米.放开挡板
后,吊舱沿着水平横杆
向点A方向匀速平移,平移速度是每秒1米.从放开挡板,直至吊舱触碰竖直放置的
为止(
),吊舱平移的时间为( )
![](https://img.xkw.com/dksih/QBM/2021/4/10/2696680417411072/2696753296687104/STEM/3b8fc1b6-b68a-42c9-bd09-90bf9e49b45e.png)
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A.30秒 | B.40秒 | C.50秒 | D.60秒 |
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【推荐1】如图,在
中,
,
,
的内切圆
与边
相切于点
,过点
作
交
于点
,过点
作
的切线交
于点
,则
的值等于( )
![](https://img.xkw.com/dksih/QBM/2018/11/9/2072060152111104/2074884509024256/STEM/e4ff9ed56d3148ca80a238c942d1a8ac.png?resizew=148)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,
是
的直径,点C是
上一点,且点D是
的中点,过点D作
的切线与
的延长线交于点E,连接
.若
,
,则直径
的长为( )
![](https://img.xkw.com/dksih/QBM/2022/5/21/2984070673498112/2984098318729216/STEM/554e9f41f012435898e82e7c16e06352.png?resizew=151)
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