如图,AB是⊙O的切线,B为切点,AO与⊙O交于点C.若∠BAO=40°,则∠CBA的度数为( )
![](https://img.xkw.com/dksih/QBM/2017/11/9/1813407647825920/1814381351288832/STEM/0bef13eca78740e68cf8aed35831b8ba.png?resizew=101)
![](https://img.xkw.com/dksih/QBM/2017/11/9/1813407647825920/1814381351288832/STEM/0bef13eca78740e68cf8aed35831b8ba.png?resizew=101)
A.15° | B.20° | C.25° | D.30° |
更新时间:2017-11-22 22:23:26
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