已知AB是⊙O的直径,过点A的弦AD平行于半径OC,若∠A=70°,则∠B等于( )
![](https://img.xkw.com/dksih/QBM/2021/10/12/2827743496257536/2828511138758656/STEM/b4de3564667b4101afcbc851513055c5.png?resizew=113)
![](https://img.xkw.com/dksih/QBM/2021/10/12/2827743496257536/2828511138758656/STEM/b4de3564667b4101afcbc851513055c5.png?resizew=113)
A.30° | B.35° | C.40° | D.60° |
更新时间:2021-10-13 16:03:33
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【推荐1】如图,
为
的两条弦,D,G分别为
的中点,
的半径为2.若
,则
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b173ac8cc4ac4f1c9e1daaa605fbb27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
A.2 | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,
中,直径
,则下列结论①
是正三角形;②
;③
;④
,正确的个数有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/8688a7f1-e209-47b7-815f-c40c74f5dc8a.png?resizew=145)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad63ab71efa010821650ffe08bd907f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47fed4244fbf9e79bba5cbdb986b9faa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c36c0d4e38748fbb4a6cf5e700e5e874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0dd77ccdd91fbd630254938b3502d22.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/8688a7f1-e209-47b7-815f-c40c74f5dc8a.png?resizew=145)
A.1个 | B.2个 | C.3个 | D.4个 |
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