如图,⊙O是Rt△ABC的外接圆,∠ACB=90°,过点C作⊙O的切线,交AB的延长线于点D.设∠A=α,∠D=β,则( )
![](https://img.xkw.com/dksih/QBM/2021/6/13/2741849748307968/2743009291550720/STEM/9c8c8bc3579546d9a0f3dc686661f761.png?resizew=158)
![](https://img.xkw.com/dksih/QBM/2021/6/13/2741849748307968/2743009291550720/STEM/9c8c8bc3579546d9a0f3dc686661f761.png?resizew=158)
A.α﹣β | B.α+β=90° | C.2α+β=90° | D.α+2β=90° |
2021·浙江杭州·二模 查看更多[4]
2021年浙江省杭州市余杭区中考数学二模试题江西省宜春市丰城市第九中学2021-2022学年八年级下学期期末检测A卷数学试题(已下线)第二十四章 圆(B卷·能力提升练)-【单元测试】2022-2023学年九年级数学上册分层训练AB卷(人教版,广东专用)江西省南昌市孺子学校2022-2023学年九年级上学期12月份月考数学阶段性考试试题
更新时间:2021-07-10 19:52:56
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【推荐1】如图,在Rt△ABC中,CD是斜边AB上的中线,∠A=35°,则∠BCD=( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/fb850579-2281-4b12-9049-5239af2e10f3.png?resizew=164)
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A.35° | B.45° | C.60° | D.55° |
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【推荐2】如图,AB是半圆O的直径,CD为半圆O的弦,且
,
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【推荐1】如图,
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【推荐2】如图,在
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【推荐1】如图,△ABC中,若AB=AC,BD=CE,CD=BF,则∠EDF=( )
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【推荐2】如图,
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