已知AB//CD,H为AB、CD之间一点,E为直线CD上点C左边一点;
![](https://img.xkw.com/dksih/QBM/2021/5/19/2724480500957184/2790450288508928/STEM/80fd0d91-c480-4ff9-914a-787bde8a80ac.png)
![](https://img.xkw.com/dksih/QBM/2021/5/19/2724480500957184/2790450288508928/STEM/20c53bf5-c573-4d89-8e34-eb2cb69971d7.png)
(1)如图1所示,HF平分∠GHC,∠F=∠CHF,∠AHG=∠FCE,求证:∠A=2∠FCE;
(2)如图2所示,∠AHG:∠GHF:∠FHC=1:2:3,CF平分∠HCE,∠F=64°,求∠A的度数.
![](https://img.xkw.com/dksih/QBM/2021/5/19/2724480500957184/2790450288508928/STEM/80fd0d91-c480-4ff9-914a-787bde8a80ac.png)
![](https://img.xkw.com/dksih/QBM/2021/5/19/2724480500957184/2790450288508928/STEM/20c53bf5-c573-4d89-8e34-eb2cb69971d7.png)
(1)如图1所示,HF平分∠GHC,∠F=∠CHF,∠AHG=∠FCE,求证:∠A=2∠FCE;
(2)如图2所示,∠AHG:∠GHF:∠FHC=1:2:3,CF平分∠HCE,∠F=64°,求∠A的度数.
更新时间:2021-08-20 21:28:33
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解答题-证明题
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【推荐1】如图,四边形ABCD中,∠A=∠C=90°,BE平分∠ABC,DF平分∠ADC,BE、CD交于G点
(1)求证:∠ABC+∠ADC=180°;
(2)求证:∠G=∠CDF.
(1)求证:∠ABC+∠ADC=180°;
(2)求证:∠G=∠CDF.
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名校
【推荐2】如图,已知
,点
在
延长线上,
是
的角平分线,证明
.
![](https://img.xkw.com/dksih/QBM/2020/4/24/2448427191017472/2448997214806016/STEM/7c0c56caea2b42a884ea0938b8330067.png?resizew=148)
证明:
(______)
(______)
(等式性质)
是
的角平分线(已知)
______
(______)
______(等量代换)
(______)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
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证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7a0621aafbc7e55cd6f6b9686c214b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31caeba1a39be7f31dc591d905a52381.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a2fd4be3ef6a91bab0592b98f69741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f15a90f8712a2f33cd429680a58a838a.png)
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【推荐1】如图1,点
是直线
上一点,点
是直线
上一点,点
是直线
,
之间的一点,直线
.
;
(2)如图2,作
,
与
的平分线交于点
,若
,求
的度数;
(3)如图3,若
,点
是
上任意一点,
平分
,
,
平分
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3064b70f24e9bbcab76e0dc61274b9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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(2)如图2,作
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98c337e4b1f98e4fa86c461365308b65.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c17f08341a651584d02f5d64bc6ada4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
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【推荐2】如图,AB是⊙O的直径,BM切⊙O于点B,点P是⊙O上的一个动点(点P不与A,B两点重合),连接AP,过点O作OQ
AP交BM于点Q,过点P作PE⊥AB于点C,交QO的延长线于点E,连接PQ,OP.
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(1)求证:△BOQ≌△POQ;
(2)若直径AB的长为12.当PE= 时,四边形AEOP为菱形,并说明理由.
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【推荐1】如图,在四边形ABCD中,
,
,延长BA至点E,连接CE,且CE交AD于点F,
和
的角平分线相交于点P.
(1)①直接写出AB和CD的位置关系: ;
②求证:
.
(2)若
,
,求
的度数;
(3)若
,
,请你探究m和n之间的数量关系.
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(1)①直接写出AB和CD的位置关系: ;
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解答题-作图题
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【推荐2】问题背景:
如图①:将一副三角板中的两个直角顶点叠放在一起,其中
,
,
.
问题提出:
(1)将这两个三角板按如图①放置,若
,则
________
;
(2)将这两个三角板按如图②放置,当
时,求
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操作探究:
(3)若保持两个三角板的直角顶点叠放在一起,三角板
保持不动,试探究三角板
如何放置时,
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问题提出:
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(2)将这两个三角板按如图②放置,当
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操作探究:
(3)若保持两个三角板的直角顶点叠放在一起,三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/18/4ba73d99-46d5-4098-b858-72d265c0f12a.png?resizew=439)
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【推荐1】如图,在
中,
,
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等于多少度?
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解答题-作图题
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【推荐2】
中,
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绕点A逆时针旋转
得到线段
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,
.
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(1)依题意补全图形;
(2)若
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的值,使
时,线段
的长为
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(1)依题意补全图形;
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(3)写出一个
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
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