如图,AB为⊙O的直径,弦CD⊥AB于点E,若CD=8,且AE:BE=1:4,则AB的长度为( )
![](https://img.xkw.com/dksih/QBM/2017/9/22/1779663818014720/1779671091748864/STEM/d8d64965fe9d4e8f90932b29659e0c36.png?resizew=117)
![](https://img.xkw.com/dksih/QBM/2017/9/22/1779663818014720/1779671091748864/STEM/d8d64965fe9d4e8f90932b29659e0c36.png?resizew=117)
A.10 | B.5 | C.12 | D.![]() |
更新时间:2017-10-01 16:42:54
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【推荐1】如图,AB是⊙O的直径,弦CD⊥AB于点E,AC=CD,⊙O的半径为2
,则△AOC的面积为( )
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968401004027904/2968769671561216/STEM/81526f19-b322-4bc6-a135-04c7dcb125bf.png?resizew=180)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968401004027904/2968769671561216/STEM/81526f19-b322-4bc6-a135-04c7dcb125bf.png?resizew=180)
A.![]() | B.2 | C.2![]() | D.4 |
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【推荐2】如图,AB是⊙O的直径,AB垂直于弦CD,∠BOC=70°,则∠ABD=( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/e489469d-0efa-4aae-acb3-45cce7ceea15.png?resizew=158)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/e489469d-0efa-4aae-acb3-45cce7ceea15.png?resizew=158)
A.20° | B.46° | C.55° | D.70° |
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