如图,点A、B、C在⊙O上,D是
的中点,若∠ACD=20°,则∠AOB的度数为( )
![](https://img.xkw.com/dksih/QBM/2019/12/25/2362563311271936/2362983896645632/STEM/3de414fb380d440580554efdb11f59aa.png?resizew=105)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aefb3de18ef88fa8c0b05e0bde11501.png)
![](https://img.xkw.com/dksih/QBM/2019/12/25/2362563311271936/2362983896645632/STEM/3de414fb380d440580554efdb11f59aa.png?resizew=105)
A.60° | B.70° | C.80° | D.90° |
更新时间:2019-12-25 22:45:57
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【推荐1】如图,点A,B,C,D,E在⊙O上,AB=CD,∠AOB=42°,则∠CED=( )
![](https://img.xkw.com/dksih/QBM/2021/11/23/2857573947539456/2862388681138176/STEM/cffc12e7-287d-4446-a4fe-73328f7ff147.png)
![](https://img.xkw.com/dksih/QBM/2021/11/23/2857573947539456/2862388681138176/STEM/cffc12e7-287d-4446-a4fe-73328f7ff147.png)
A.42° | B.48° | C.21° | D.16° |
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【推荐2】下列语句,错误的是( )
A.直径是弦 | B.过圆心的弦是直径 |
C.平分弧的直径垂直于弧所对的弦 | D.相等的圆心角所对的弧相等 |
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【推荐1】如图,
为
的直径,
,则
的度数为( )
![](https://img.xkw.com/dksih/QBM/2022/12/15/3131202203844608/3132231263518720/STEM/32db6be0afd744d6919576efedf956c5.png?resizew=171)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af27a9d64efdff9575ab5f5d8a26a186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://img.xkw.com/dksih/QBM/2022/12/15/3131202203844608/3132231263518720/STEM/32db6be0afd744d6919576efedf956c5.png?resizew=171)
A.70° | B.75° | C.80° | D.85° |
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【推荐2】如图,
是
直径,若
,则
的度数是( )
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897859119742976/2916927309209600/STEM/68feabfb-ce46-4836-9539-a34dfb30a25c.png?resizew=126)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb998fbf2ce7f0ba832648322c1c2a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897859119742976/2916927309209600/STEM/68feabfb-ce46-4836-9539-a34dfb30a25c.png?resizew=126)
A.40° | B.35° | C.30° | D.25° |
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