如图,点A,B,C在⊙O上,CO的延长线交AB于点D,∠A=50°,∠B=30°,则∠ADC的度数为( )
![](https://img.xkw.com/dksih/QBM/2018/11/13/2074733423132672/2075407010160640/STEM/fe0edc56a3294281a02a481c36855036.png?resizew=103)
![](https://img.xkw.com/dksih/QBM/2018/11/13/2074733423132672/2075407010160640/STEM/fe0edc56a3294281a02a481c36855036.png?resizew=103)
A.70° | B.90° | C.1![]() | D.120° |
16-17九年级上·北京东城·期末 查看更多[9]
更新时间:2016-03-02 14:44:48
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【推荐1】如图,O为原点,点A的坐标为(3,0),点B的坐标为(0,4),⊙D过A、B、O三点,点C为
上一点(不与O、A两点重合),则cosC的值为( )
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,PA,PB是⊙O的切线,切点分别为A,B,点C在⊙O上,且
是优弧,则∠ACB等于( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/15ab788a-34ab-4981-bee6-62b1603db0a7.png?resizew=150)
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A.180°-2∠P | B.180°-∠P | C.90°-![]() | D.∠P |
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