如图,已知圆O的直径为6,CD为圆O的直径,且CD⊥AB,∠D=15°.则OE的长为( )
![](https://img.xkw.com/dksih/QBM/2018/2/10/1879335342686208/1880521238462464/STEM/49752730cb7443739a891a688d5e15a8.png?resizew=142)
![](https://img.xkw.com/dksih/QBM/2018/2/10/1879335342686208/1880521238462464/STEM/49752730cb7443739a891a688d5e15a8.png?resizew=142)
A.3 | B.3![]() | C.![]() | D.![]() ![]() |
更新时间:2018-02-12 07:13:09
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【推荐1】如图所示,已知⊙O的半径为8cm,把弧A1mB1沿A1B1翻折使弧A1mB1经过圆心O,这个过程记为第一次翻折;将弧A2OB2沿着A2B2翻折使弧A2OB2经过A1B1的中点,其中A2B2∥A1B1,这个过程记为第二次翻折;……按照这样的规律翻折下去,第4次翻折的折痕A4B4长度为( )
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【推荐2】如图,AB是⊙O的弦,OC⊥AB,交⊙O于点C,连接OA,OB,BC,若∠ABC=20°,则∠BAO的度数是( )
![](https://img.xkw.com/dksih/QBM/2020/1/14/2376984411504640/2377713112498176/STEM/a2302de4-0392-4fdc-9ab9-920d5d19b081.png)
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