如图,
中,
是
的直径,
交
于点
,
交
于点
,点
是
中点,
的切线
交
于点
,则下列结论中①
;②
;③
;④
是
中点,正确的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/37a8f086-15c8-495b-b263-b20f74ca6c3e.png?resizew=171)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/37a8f086-15c8-495b-b263-b20f74ca6c3e.png?resizew=171)
A.1 | B.2 | C.3 | D.4 |
22-23九年级·全国·单元测试 查看更多[1]
(已下线)第二十四章 圆(B卷·学霸加练卷,难度★★★★★)-【单元测试】2022-2023学年九年级数学分层训练AB卷(人教版)
更新时间:2022-09-29 18:30:01
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适中
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【推荐1】如图,已知
中,
,
为
内一点,过点
的直线
分别交
、
于点
、
.若
在
的中垂线上,
在
的中垂线上,则
的度数为( ).
![](https://img.xkw.com/dksih/QBM/2020/12/11/2611781450104832/2615231156240384/STEM/5d48c4b35d9c48198387b695dc745ff0.png?resizew=191)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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A.100° | B.105° | C.115° | D.无法确定 |
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【推荐2】如图,
的对角线
、
交于点
平分
交
于点
,且
,
,连接
,下列结论:①
;②
;③![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a836d2dfc31d2bfc949bac8403cf2a4e.png)
;④
;⑤
;其中成立的个数是( )
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A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】如图,菱形
各边的中点分别是
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,四边形 ABCD 中,AD=BC,E、F、G 分别是 AB、CD、AC 的中点,若∠DAC=20 º,∠ACB=90 º,则 ∠FEG=( )
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【推荐1】如图,在⊙O中,OA=AB,OC⊥AB,则下列结论错误的是( )
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A.△OAB是等边三角形 | B.OC平分弦AB |
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【推荐2】如图,
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【推荐1】当你站在博物馆的展览厅中时,你知道站在何处观赏最理想吗?如图,设墙壁上的展品最高点P距地面2.5米,最低点Q距地面2米,观赏者的眼睛F距地面1.6米,当视角∠PEQ最大时,站在此处观赏最理想,则此时E到墙壁的距离为( )米.
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【推荐2】如图,
是⊙O的切线,点A为切点,BO交⊙O于点C,BO的延长线交⊙O于点D,点E在优弧CDA上,连接AD、AE、CE,若∠BAD=122°,则∠CEA的度数为( )
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A.26° | B.32° | C.64° | D.128° |
您最近一年使用:0次