如图,
、
、
分别与
相切于点A,B,E,
与
、
分别相交于C,D两点,若
,则
的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/6194fd4e-9c56-41b2-92ad-dc8afb3ba845.png?resizew=187)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d67a3b297e4308b3683b3760c1c71f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ecb7621ac73d91b5c3a51cf63b5929d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/6194fd4e-9c56-41b2-92ad-dc8afb3ba845.png?resizew=187)
A.50° | B.62° | C.66° | D.70° |
更新时间:2024-01-11 23:55:26
|
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【推荐1】如图,已知
,且
,
和
的角平分线相交于点D.以下结论:①
;②
;③
;④
;⑤
;其中正确的有________个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b77c8ef75793d21d2d5d8bf470a61159.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35803969509655f72b4118503ae1c966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/752fa646a2d9cfca34001748445301c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00492abe42e58a4a495baf1f384dff87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/383e83b51f1bfbf0ee08d03a22edb16e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f19797a50caf9c20c648a9357341f29c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1aec35206a18020987f5b2842af9559.png)
A.1 | B.2 | C.3 | D.4 |
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【推荐2】如图,已知在
,若以点
为圆心,
长为半径画弧,交腰
于点
,则下列结论一定正确的是()
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa90db29dc0badb8a25921f9710f6b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,四边形
中,
,在
上分别找一点M、N,使
周长最小时,则
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/776b83e79e3ac696ddb2010a6eb865c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e5141e0c913ff7ea7787d48f7c1d984.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89d17e21531b6721aa109c6a91146c84.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/21/e4f04b17-2534-4d69-b25b-c32e2df4576e.png?resizew=138)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图所示,四边形
中,
,在
上分别找一点
,要使
周长最小,此时
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c7e1be05c0ffe00d76b1fb6688d4532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481e426224c3a3ce9bb5a731eed81c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a9fc2dda89829fa2c610a8fce86d22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89d17e21531b6721aa109c6a91146c84.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,在△ABC中,AB=AC,以BC为直径画半圆交AB于E,交AC于D ,
的度数为40°则∠A的度数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/26/dfb0e651-1e61-4066-b31d-62c052a28d47.png?resizew=98)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/26/dfb0e651-1e61-4066-b31d-62c052a28d47.png?resizew=98)
A.40° | B.70° | C.50° | D.20° |
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【推荐2】如图,
是等边三角形,点
为
外一点,连接
,若
,则
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8675339af8e4efed96e57f60cd6c3b5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da996c5174b10a75a0f9c9c751581497.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/26/2eebf77e-9df6-4fa1-9bba-656be8c57a74.png?resizew=126)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,PA,PB是⊙O的两条切线,A,
B为切点,直线OP交⊙O于C,D,交AB于E,AF为⊙O的直径,下列结论中正确的有:①∠ABP=∠AOP;②AP=BP;③弧BC=弧DF ;④∠APO=∠BPO;⑤AB⊥PD.
![](https://img.xkw.com/dksih/QBM/2018/12/17/2098603825463296/2100186281615360/STEM/faec8c69b34f45188a517d9b0db1b643.png?resizew=169)
![](https://img.xkw.com/dksih/QBM/2018/12/17/2098603825463296/2100186281615360/STEM/1617f870a12b4b8dac72e7acc45528be.png?resizew=4)
![](https://img.xkw.com/dksih/QBM/2018/12/17/2098603825463296/2100186281615360/STEM/faec8c69b34f45188a517d9b0db1b643.png?resizew=169)
A.①⑤ | B.②③⑤ | C.①④ | D.①②③④⑤ |
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【推荐2】如图,AC是⊙0的直径,∠ACB=60°,连接AB,过A,B两点分别作⊙O的切线,两切线交于点P.若已知⊙0半径为1,则△PAB的周长为( )
![](https://img.xkw.com/dksih/QBM/2017/5/2/1678514816098304/1684621538492416/STEM/522c448a87194b208b251353920f5a3a.png?resizew=144)
![](https://img.xkw.com/dksih/QBM/2017/5/2/1678514816098304/1684621538492416/STEM/522c448a87194b208b251353920f5a3a.png?resizew=144)
A.![]() | B.![]() | C.![]() | D.3 |
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