如图,⊙O是
的外接圆,AD是切线,BC的延长线交AD于点D,
,
,则
的度数为( )
![](https://img.xkw.com/dksih/QBM/2019/3/12/2158956445237248/2166929646116865/STEM/a485f2ec39cd4701951512dba33ec009.png?resizew=186)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2c8b773e44f9d79662838a44ab4e6b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004a91e1041796da61988cfbdec55f1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://img.xkw.com/dksih/QBM/2019/3/12/2158956445237248/2166929646116865/STEM/a485f2ec39cd4701951512dba33ec009.png?resizew=186)
A.25° | B.30° | C.35° | D.40° |
更新时间:2019-04-14 19:38:29
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【推荐1】如图,四边形
内接于⊙O,
是直径,D是弧
的中点,若
,则
的大小为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640e9e7c56e8eeda044fb55396088816.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,⊙O与正方形ABCD的两边AB.AD都相切,且DE与⊙O相切于点E,若正方形ABCD的边长为4,
,则OD的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/328a755e-df65-4e7b-a2b7-c25067b68604.png?resizew=141)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6370d6c626bdabf1fc694501ee6c714f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/328a755e-df65-4e7b-a2b7-c25067b68604.png?resizew=141)
A.![]() | B.![]() | C.![]() | D.4 |
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【推荐2】关于圆有如下的命题:①平分弦的直径垂直于弦;②不在同一直线上的三个点确定一个圆;③三角形的内心到三角形三条边的距离相等;④圆的切线垂直于半径;⑤在同圆或等圆中,如果两条弦相等,那么他们所对的圆周角相等.其中命题正确的是有( )个.
A.2 | B.3 | C.4 | D.5 |
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