如图,△ABD的三个顶点在⊙O上,AB是直径,点C在⊙O上,且∠ABD=46°,则∠BCD等于( )
![](https://img.xkw.com/dksih/QBM/2018/1/18/1863026560712704/1865946562183169/STEM/4bd43c42db5f43678c35f3bddd01dc36.png?resizew=87)
![](https://img.xkw.com/dksih/QBM/2018/1/18/1863026560712704/1865946562183169/STEM/4bd43c42db5f43678c35f3bddd01dc36.png?resizew=87)
A.34° | B.44° | C.46° | D.54° |
更新时间:2018-01-22 17:00:54
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【推荐1】如图,△ABC为⊙O的内接三角形,AB为直径,∠ACB的平分线CD交⊙O于点D,且CB=CD,则∠CBA的度数是( )
![](https://img.xkw.com/dksih/QBM/2019/6/22/2230974237728768/2232009112748032/STEM/79f592ff0b4a471a9bc67a8298679068.png?resizew=180)
![](https://img.xkw.com/dksih/QBM/2019/6/22/2230974237728768/2232009112748032/STEM/79f592ff0b4a471a9bc67a8298679068.png?resizew=180)
A.15° | B.22.5° | C.30° | D.62.5° |
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【推荐2】如图,
是
的直径,
是
的切线,
为切点,
与
交于点
,连结
.若
,则
的度数为( )
![](https://img.xkw.com/dksih/QBM/2020/8/4/2520636708134912/2520691369795584/STEM/f1a62164-019e-46bd-9219-2874a3822a8c.png)
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f03d2fb1ecb2e36fb24bb21f80e07a4e.png)
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![](https://img.xkw.com/dksih/QBM/2020/8/4/2520636708134912/2520691369795584/STEM/f1a62164-019e-46bd-9219-2874a3822a8c.png)
A.40° | B.50° | C.60° | D.80° |
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【推荐1】如图,
是
的外接圆
的直径,若
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3223054560c8296227763d4cbb90194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/11/b2ae87a0-37aa-4c7f-9954-53ceb2659ba7.png?resizew=184)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,AB为⊙O直径,按如下步骤作图:①以点A为圆心,适当的长为半径做圆弧交⊙O于点C,D;②连接AC,AD,BC,BD.则下列结论不一定成立的是( )
![](https://img.xkw.com/dksih/QBM/2021/4/27/2708912645709824/2709575724417024/STEM/af72d5da-1fc0-4e71-8d6f-f13d0e7a99be.png)
![](https://img.xkw.com/dksih/QBM/2021/4/27/2708912645709824/2709575724417024/STEM/af72d5da-1fc0-4e71-8d6f-f13d0e7a99be.png)
A.AB⊥CD | B.BC=BD | C.∠CBD=2∠ACD | D.BC=CD |
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