如图,BC是⊙O的一条弦,经过点B的切线与CO的延长线交于点A,若∠C=23°,则∠A的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/6efa265a-5bb4-47cd-9c27-7d122aeb130a.png?resizew=160)
A.38° | B.40° | C.42° | D.44° |
更新时间:2020-05-19 21:20:59
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【推荐1】下列命题是真命题的是( )
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【推荐2】如图,AD,AE分别是△ABC的高和角平分线,若∠B=30°,∠C=50°,则∠DAE的度数为( )
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【推荐2】如图,
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【推荐1】如图,AD,CD为⊙O的两条弦,过点C的切线交OA延长线于点B,若∠D=29°,则∠B的度数为( )
![](https://img.xkw.com/dksih/QBM/2021/4/8/2695357099278336/2696212667015168/STEM/d7a858b7-85d7-4513-bf00-8e87234a98e9.png)
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A.22° | B.26° | C.29° | D.32° |
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【推荐2】如图,AB为⊙O的切线,点A为切点,OB交⊙O于点C,点D在⊙O上,连接AD,CD,OA,若∠ADC=28°,则∠ABO的大小( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/af70eb56-0639-4385-86a4-5dc9ae3ec4bc.png?resizew=127)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/af70eb56-0639-4385-86a4-5dc9ae3ec4bc.png?resizew=127)
A.28° | B.34° | C.56° | D.62° |
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