将一副直角三角板按如图所示的方式放置,若
平分
,则
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-04-22 14:37:34
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【推荐1】将一副三角板如图摆放,∠OAB=∠OCD=90°,∠AOB=60°,∠COD=45°,OM平分∠AOD,ON平分∠COB,则∠MON的度数为( )
![](https://img.xkw.com/dksih/QBM/2020/5/21/2467537429725184/2468194610282496/STEM/24aeb98de20d42668cc6f92997000da3.png?resizew=200)
![](https://img.xkw.com/dksih/QBM/2020/5/21/2467537429725184/2468194610282496/STEM/24aeb98de20d42668cc6f92997000da3.png?resizew=200)
A.60° | B.45° | C.65.5° | D.52.5° |
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【推荐2】一副直角三角尺叠放如图①所示,现将含
的三角尺
固定不动,将含
的三角尺
绕顶点A顺时针转动,使两块三角尺至少有一组边互相平行,求
.对于其答案,甲答:
;乙答:
;丙答:
;则正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35803969509655f72b4118503ae1c966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/518e0f9afe701015dce4b359705c59f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3657f0b0446428b86d98757cf55ea418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76cd81e6228efb3efbc2d126e05740fa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/17/80ffd21b-eb8a-4036-a0ed-146a163cc528.png?resizew=105)
A.甲、乙答案合在一起才完整 | B.甲、丙答案合在一起才完整 |
C.三人答案合在一起才完整 | D.三人答案合在一起也不完整 |
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解题方法
【推荐1】如图,在直线AC的同一侧作两个等边三角形△ABD和△BCE,连接AE与CD交于点H,AE与DB交于点G,BE与CD交于点F,下列结论:①AE=CD;②∠AHD=60°;③△AGB≌△DFB;④BH平分∠GBF;⑤GF∥AC;⑥点H是线段DC的中点.正确的有( )
A.6个 | B.5个 | C.4个 | D.3个 |
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【推荐2】如图,直线AB,CD相交于点O,OE⊥AB于点O,OF平分∠AOE,∠1=20°则下列结论不正确的是( )
![](https://img.xkw.com/dksih/QBM/2019/5/6/2197886134222848/2201883780726785/STEM/51a72abb-f17b-4f69-a0ee-a3dbca74dc4c.png?resizew=197)
![](https://img.xkw.com/dksih/QBM/2019/5/6/2197886134222848/2201883780726785/STEM/51a72abb-f17b-4f69-a0ee-a3dbca74dc4c.png?resizew=197)
A.∠2=45° | B.∠1=∠3 | C.∠AOD与∠1互为补角 | D.∠1的余角等于160° |
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【推荐1】如图,
是
的直径,弦
交
于点
,点
是劣弧
上一点,射线
交
的延长线于点
,若
,且
,则
( )
![](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/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99335705c300addf33d2c39198a6f344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/872132d53577bbaf382016e8fd1b0f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce4669674a02a4933a2e166c014cbd6.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,△ABC中,AB的垂直平分线交BC边于点E,AC的垂直平分线交BC边于点N,若∠BAC=
,则∠EAN的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/3ad0decb-a91a-4841-babc-5dcfa71c5594.png?resizew=140)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aa0b9869db50a9ab48cc32925d8e96.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/3ad0decb-a91a-4841-babc-5dcfa71c5594.png?resizew=140)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图所示是某标志的主体部分(平面图).它是由四个完全相同的四边形
拼成的.间得
,
,
,
,则
的度数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/7d89409d-2d52-4060-9d69-bca8675cd184.png?resizew=122)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a23f35ebcd9799d82c1e41c09781a4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c54276d36db232bc3ae6327f757241c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fdd7a7dcc801f20d1b59fe1798bff07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3daae8ec60b2b1f7577dee687247cebb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/7d89409d-2d52-4060-9d69-bca8675cd184.png?resizew=122)
A.116° | B.117° | C.118° | D.119° |
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【推荐2】如图,将
绕顶点C旋转得到
,且点B刚好落在
上,若
,
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b185184dc2dc3894a0313fd13f26a59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8117b8e89b9aa4ed51fbaa8df8381c25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f6d28df01b06973a227c288dd2f87d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d161694a4c5eaaef45da9ec6fc76dd32.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/25/c4b65f0f-fc5e-4923-b074-dbcf9f9b76df.png?resizew=202)
A.![]() | B.![]() | C.![]() | D.![]() |
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