如图,AB是⊙O的直径,点D在⊙O上,连接OD、BD,过点D作⊙O的切线交BA延长线于点C,若∠C=40°,则∠B的度数为( )
![](https://img.xkw.com/dksih/QBM/2022/1/27/2903677621796864/2904189423124480/STEM/886cbd71da35495882c4248026eaf9b5.png?resizew=180)
![](https://img.xkw.com/dksih/QBM/2022/1/27/2903677621796864/2904189423124480/STEM/886cbd71da35495882c4248026eaf9b5.png?resizew=180)
A.15° | B.20° | C.25° | D.30° |
更新时间:2022-01-28 14:11:25
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