如图所示,点A是半径为2的⊙O外一点,OA=4,AB是⊙O的切线,B为切点,弦BC∥OA,连接AC,则图中阴影部分的面积为( )
![](https://img.xkw.com/dksih/QBM/2020/4/16/2442765414334464/2443546935533568/STEM/0e7b2084635a4af7962adfb12990f7dd.png?resizew=156)
![](https://img.xkw.com/dksih/QBM/2020/4/16/2442765414334464/2443546935533568/STEM/0e7b2084635a4af7962adfb12990f7dd.png?resizew=156)
A.2 | B.2![]() | C.3 | D.![]() |
更新时间:2020-04-27 16:47:51
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【知识点】 切线的性质和判定的综合应用解读
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【推荐1】如图,
为圆
的切线,
交圆
于点
,
为圆
上一点,若
,则
的度数为( ).
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,AB为半圆O的直径,AD、BC分别切⊙O于A、B两点,CD切⊙O于点E,连接OD、OC,下列结论:①∠DOC=90°,②AD+BC=CD,③S△AOD:S△BOC=AD2:AO2,④OD:OC=DE:EC,⑤OD2=DE•CD,正确的有( )
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