1 . 已知:如图,
和
都是等边三角形,
是
延长线上一点,
与
相交于点
,
与
相交于点
,
与
相交于点
,连接
,
,则下列五个结论:
①
;
②
;
③
;
④
是等边三角形;
⑤
平分
.
其中,正确的是______ .(只填写序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/169539e30546f4b7a649c7fe408f76a3.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b15b82151bff7cc0238d2034a6129f0.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59c4a4eb0723665f8231dab51c1718e.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
⑤
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbf1667b21a273bf5dd007d65eeda7c.png)
其中,正确的是
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/6c13138f-fe71-496a-bed5-dd5a1edea679.png?resizew=148)
您最近一年使用:0次
22-23八年级上·全国·期末
2 . 如图,
中,
,
,D为线段
上一动点(不与点B,C重合),连接
,作
,
交线段
于E.以下四个结论:
①
;
②当D为
中点时,
;
③当
为等腰三角形时,
;
④当
时,
.
其中正确的结论是______ (把你认为正确结论的序号都填上).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640e9e7c56e8eeda044fb55396088816.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9608cad892644b4094ed6438b69572.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bebd95e4e02ded19f5c0a8de71c27ae7.png)
②当D为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2bc5547bb6d2a7a315962ff75f6ba8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115d56f2dca3e53ef6db9761cfef7f6e.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e4dbea6a5faecdd8f6c06cf9fd43a90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
其中正确的结论是
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/56a89dea-6703-43c6-80fd-f2a959fbae70.png?resizew=197)
您最近一年使用:0次
3 . 如图,△ABC和△DCE都是等边三角形,且点B、C、E在同一直线上,AE与BD、CD分别交于点F、H,AC与BD交于点G,连接CF、GH.则下列结论正确的是 _____ .(写出所有正确结论的序号)
①AE=BD;②GD=HE;③△CGH是等边三角形;④CF平分∠BFE;⑤BF=CF+AF.
①AE=BD;②GD=HE;③△CGH是等边三角形;④CF平分∠BFE;⑤BF=CF+AF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/25/63aa8f25-7064-4a67-8320-dcba5a3e3d36.png?resizew=234)
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4 . 如图,在矩形ABCD中,
,
的平分线交BC于点E,
于点H,连接BH并延长交CD于点F,连接DE交BF于点O,下列结论:①
;②
;③
;④
;其中正确结论的序号是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc1d36437d9e50f560536853ecd636d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344067523ee04f5cc546978ca0116e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2226397b9bdbc77087433b05fb61209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3aa1da9eef031c9562154530cbafb33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63bd6879942ca6773046e8ce3ee30f40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a317694e9df706c7d51d4b930f9a2a1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/79dc483c-6029-4eaf-a279-41f6e4d29cbc.png?resizew=153)
您最近一年使用:0次
21-22八年级上·浙江杭州·期末
5 . 如图,在△ABC中,∠ACB=90°,D为AB上任一点,过D作AB的垂线,分别交边AC、BC的延长线于E、F两点,∠BAC、∠BFD的平分线交于点I,AI交DF于点M,FI交AC于点N,连接BI.下列结论:①∠BAC=∠BFD;②∠ABI=∠FBI;③AI⊥FI;④∠ENI=∠EMI;其中正确结论的序号是_________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/bdc430b7-0dd0-4123-b600-bf92f6a2aa8a.png?resizew=138)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/bdc430b7-0dd0-4123-b600-bf92f6a2aa8a.png?resizew=138)
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6 . 如果三角形的两个内角
与
满足
,那么我们称这样的三角形为“准直角三角形”.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/4/9b909ce6-6dfb-4849-8212-2380030fd289.jpg?resizew=338)
(1)关于“准直角三角形”,下列说法:
①在
中,若
,
,
,则
是准直角三角形;
②若
是“准直角三角形”,
,
,则
;
③“准直角三角形”一定是钝角三角形.其中,正确的是 .(填写所有正确结论的序号)
(2)如图①,在
中,
,
是
的角平分线.
求证:
是“准直角三角形”.
(3)如图②,
、
为直线
上两点,点
在直线
外,且
.若
是
上一点,且
是“准直角三角形”,请直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/106f8de7fde5a4d67448debb9437194e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/4/9b909ce6-6dfb-4849-8212-2380030fd289.jpg?resizew=338)
(1)关于“准直角三角形”,下列说法:
①在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c3975d0e87ea5028d37444dca76b331.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0374c406b563f0d258aa5c2654bbd06e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7520a232298fcf28040a67feeaa7daf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c554100e16141964f74a5a743f6b29e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b030708f7e622f3f992649b21eec6b4c.png)
③“准直角三角形”一定是钝角三角形.其中,正确的是 .(填写所有正确结论的序号)
(2)如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58196842483577dbc6be9bc873651d2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c505c02c59313fe0108392a5bf5127.png)
(3)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50139f281e4d1a6d1dcb4f4327d7b2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf13c20214c9f40e8c165c0de7106cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
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7 . 如图,△ABC中,AC=BC,∠C=90°,AD平分∠BAC,DE⊥AB于E,现给出以下结论:①AD平分∠CDE;②DE平分∠ADB;③∠BAC=∠BDE;④AC+BE=AB.其中正确的是________ .(写出所有正确结论的序号)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/a25d597c-2890-4d4e-973a-52c048dccea0.png?resizew=156)
您最近一年使用:0次
2022-06-23更新
|
223次组卷
|
2卷引用:福建省三明市2021-2022学年七年级下学期期末数学试题
8 . 如图,点
是等边三角形
内部一点,连接
、
、
,且
,现将
绕点
顺时针旋转到
的位置,对于下列结论:①
是等边三角形;②
;③
;④
.其中结论正确的是__________ (填序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c3fe3eddc09024fdbce00cd08ab4b98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f517953a21c2a45fd8465072c44bfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90de825299eb86f8661b70a8accfa596.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02413d06ae10743c4ae0748ef02a2131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f4cb33cdb3e2994ac7b9a0abbabed2.png)
![](https://img.xkw.com/dksih/QBM/2022/1/8/2897166123499520/2916338960744448/STEM/4d2810f6ec5f4bc8bb9777e32017da20.png?resizew=177)
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名校
9 . 如图,已知点
是射线
上一点,过
作
交射线
于点
,
交射线
于点
,给出下列结论:①
是
的余角;②图中互余的角共有3对;③
的补角只有
;④与
互补的角共有3个,其中正确结论有______ (把你认为正确的结论的序号都填上).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e1e803e0130cd7a3967eff90f11ffb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5232ca3c1e0ce4064d0094502aacb063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/752fa646a2d9cfca34001748445301c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/ca860cec-477f-47dd-92a1-fe05052935b6.png?resizew=172)
您最近一年使用:0次
2022-01-15更新
|
283次组卷
|
2卷引用:江苏省苏州市苏州高新区实验初级中学2021-2022学年七年级上学期期末数学试题
10 . 数学概念:如图①,在△ABC中,D为∠ABC的对边AC上一点(点D不与点A、C重合),连接BD.若∠ADB和∠CDB这两个角中至少存在1个与∠ABC相等,则称BD为△ABC中∠ABC的等角分割线.
![](https://img.xkw.com/dksih/QBM/2021/10/29/2839691527626752/2914084275544064/STEM/e658bece-a4a4-44ae-be2f-fcb31a9e1f89.png?resizew=268)
(1)概念理解:如图②,在Rt△ABC中,∠C=90°,∠B=60°.分别画出∠B和∠C的等角分割线BD、CE.(画图工具不限,并做出适当的标注)
(2)知识运用:在△ABC中,∠A=50°,∠ACB=70°.已知∠ABC、∠ACB的等角分割线BD、CE相交于点O,求∠BOC的度数.
(3)深入思考:下列关于“等角分割线”的结论:
①钝角三角形中的钝角有2条等角分割线;
②三个角都不相等的三角形中,最小的角没有等角分割线;
③三角形的高、角平分线可能是该三角形中的等角分割线;
④任意一个三角形中最少有1条等角分割线,最多有3条等角分割线.
其中所有正确结论的序号是 .
![](https://img.xkw.com/dksih/QBM/2021/10/29/2839691527626752/2914084275544064/STEM/e658bece-a4a4-44ae-be2f-fcb31a9e1f89.png?resizew=268)
(1)概念理解:如图②,在Rt△ABC中,∠C=90°,∠B=60°.分别画出∠B和∠C的等角分割线BD、CE.(画图工具不限,并做出适当的标注)
(2)知识运用:在△ABC中,∠A=50°,∠ACB=70°.已知∠ABC、∠ACB的等角分割线BD、CE相交于点O,求∠BOC的度数.
(3)深入思考:下列关于“等角分割线”的结论:
①钝角三角形中的钝角有2条等角分割线;
②三个角都不相等的三角形中,最小的角没有等角分割线;
③三角形的高、角平分线可能是该三角形中的等角分割线;
④任意一个三角形中最少有1条等角分割线,最多有3条等角分割线.
其中所有正确结论的序号是 .
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