【初步认识】
(1)如图①,在
中,
平分
,
平分
.若
,则
______;如图②,
平分
,
平分外角
,则
与
的数量关系是______;
【继续探索】
(2)如图③,
平分外角
,
平分外角
.请探索
与
之间的数量关系;
【拓展应用】
(3)如图④,点P是
两内角平分线的交点,点N是
两外角平分线的交点,延长
交于点M.在
中,存在一个内角等于另一个内角的2倍,求
的度数.
(1)如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8793053fbb2ac5a3122b092a575124.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b6fede7d2da3ccecf3f9d32a10346c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a742abf1b0702125a0c77cbfbef118ca.png)
【继续探索】
(2)如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79cd9d0d73549e2944578f3513631ce5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9222c2a8519ef3f4e80e8ca3d6a72b3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86bfa0bbe05b01453e6ed15d74da2602.png)
【拓展应用】
(3)如图④,点P是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa2b4aaa6fa77b53cbb73fd96f0e54d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d0469336f71edd52dc9148c67db052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/0dcfc439-a0d0-41ba-9eb0-8972030f960f.png?resizew=611)
更新时间:2023-12-15 21:07:12
|
相似题推荐
解答题-证明题
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【推荐1】如图,已知
,M,N分别是直线AB,CD上一点,点E在直线AB,CD之间.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/b543fee3-ff19-4f03-93fe-bbdb05e524cb.png?resizew=662)
(1)如图1,求证:
;
(2)如图2,F是EM上一点,NE平分
,FH平分
,试探究
与
之间的数量关系?并证明你的结论;
(3)如图3,P为直线MN上一动点(不与点N重合),过点P作
交直线CD于点G,∠PNG的角平分线和∠PGC的角平分线交于点O,则∠O的度数为______(直接写出结果).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/b543fee3-ff19-4f03-93fe-bbdb05e524cb.png?resizew=662)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1386e71e98d795a651b5773fed6595d2.png)
(2)如图2,F是EM上一点,NE平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55bdea5402c61b5b273656bd74b1ac01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611828939358024cb6fed4844dc73f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5650afdafa76253e28f700061bc74436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502b2e185cf1eede6730577e6924e486.png)
(3)如图3,P为直线MN上一动点(不与点N重合),过点P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa1424bc84278d67d403df260e8269c.png)
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【推荐2】以
的
、
为边作
和
,且
,
,
与
相交于M,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/89b4edd6-9c2c-4ba6-ae32-6578c27518d1.png?resizew=308)
(1)如图1,求证:
;
(2)在图1中,连接
,则
________,
________;(都用含
的代数式表示)
(3)如图2,若
,G、H分别是
、
的中点,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ee81929c987732fcb379802eeef7a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9311239c58a3e3e424b309687d6cb3ba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/89b4edd6-9c2c-4ba6-ae32-6578c27518d1.png?resizew=308)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb9e2b2332403444a51a71c0c575f1d9.png)
(2)在图1中,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5521d0070aa23dc0fe22956cc35ee3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb985ac5d93b85b6299834627aa95ab7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51af2577e349157f70effa2a074c9c23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e508a2988b9f7e922b42f7f8256b0d0a.png)
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【推荐3】在△ABC中,BD平分∠ABC交AC于点D,点E是射线AC上的动点(不与点D重合),过点E作EF∥BC交直线BD于点F,∠CEF的角平分线所在直线与射线BD交于点G.
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968534316359680/2970936048328704/STEM/8044a68230f746e99928b55ba4f24618.png?resizew=531)
(1)如图1,点E在线段AD上运动.
①若∠ABC=40°,∠C=60°,则∠BGE=______°;
②若∠A=70°,则∠BGE=______;
③探究∠BGE与∠A之间的数量关系,并说明理由;
(2)若点E在射线DC上运动时,∠BGE与∠A之间的数量关系与(1)③中的数量关系是否相同?若不同,请写出它们之间的数量关系并说明理由.
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968534316359680/2970936048328704/STEM/8044a68230f746e99928b55ba4f24618.png?resizew=531)
(1)如图1,点E在线段AD上运动.
①若∠ABC=40°,∠C=60°,则∠BGE=______°;
②若∠A=70°,则∠BGE=______;
③探究∠BGE与∠A之间的数量关系,并说明理由;
(2)若点E在射线DC上运动时,∠BGE与∠A之间的数量关系与(1)③中的数量关系是否相同?若不同,请写出它们之间的数量关系并说明理由.
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【推荐1】【问题初探】
(1)如图,
是
的平分线,点D为
上一点且
,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/e975e790-6658-45ab-afce-05e57793da68.png?resizew=125)
小明的想法是:过点
,分别作
和
的垂线,通过构造全等三角形和等腰三角形解决问题,
小强的想法是:在
上截取
,然后利用全等三角形和等腰三角形的性质解决问题,
请你选择一种方法完成证明,其它方法也可以;
【类比分析】
(2)如图,在三角形
中,
,
,
的平分线交
于点D,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/ed86c634-b56d-4124-96e7-99e40399f81d.png?resizew=170)
【学以致用】
(3)如图,
中,
,点D为
外一点.若CD//AB,点M在
边上,且
,求证
.
(1)如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eaffcd2070bfcb1955e2cab66c26c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9195351b3d8d057e5725213bc8f72da.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/e975e790-6658-45ab-afce-05e57793da68.png?resizew=125)
小明的想法是:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
小强的想法是:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebba1f34ceeeda357c6796d4dfc4a19c.png)
请你选择一种方法完成证明,其它方法也可以;
【类比分析】
(2)如图,在三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c3975d0e87ea5028d37444dca76b331.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea16fdef196f7d3fd65c5e2c509f6c39.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/ed86c634-b56d-4124-96e7-99e40399f81d.png?resizew=170)
【学以致用】
(3)如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae26339b26f044f6e7f86a5227faafe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c33f05acd392b64410ec012ac18b5ab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/4078e588-062b-484f-beaf-ea11603071a8.png?resizew=118)
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解题方法
【推荐2】【概念认识】
如图①,在∠ABC 中,若∠ABD=∠DBE=∠EBC,则 BD,BE 叫做∠ABC 的“三分线”.其中,BD 是“邻 AB 三分线”,BE 是“邻 BC 三分线”.
![](https://img.xkw.com/dksih/QBM/2021/9/9/2804602319699968/2805112507064320/STEM/23e2334a1afb494f9c4285c7e75d10bb.png?resizew=540)
【问题解决】
(1)如图②,在△ABC 中,∠A=73°,∠B=42°,若∠B 的三分线 BD 交 AC 于点 D, 则∠BDC= °;
(2)如图③,在△ABC 中,BP、CP 分别是∠ABC 邻 AB 三分线和∠ACB 邻 AC 三分线, 且 BP⊥CP,求∠A 的度数;
【延伸推广】
(3)在△ABC 中,∠ACD 是△ABC 的外角,∠B 的三分线所在的直线与∠ACD 的三分线所在的直线交于点 P.若∠A=α°,∠B=β°,直接写出∠BPC 的度数.(用含 α、β 的代数式表示)
如图①,在∠ABC 中,若∠ABD=∠DBE=∠EBC,则 BD,BE 叫做∠ABC 的“三分线”.其中,BD 是“邻 AB 三分线”,BE 是“邻 BC 三分线”.
![](https://img.xkw.com/dksih/QBM/2021/9/9/2804602319699968/2805112507064320/STEM/23e2334a1afb494f9c4285c7e75d10bb.png?resizew=540)
【问题解决】
(1)如图②,在△ABC 中,∠A=73°,∠B=42°,若∠B 的三分线 BD 交 AC 于点 D, 则∠BDC= °;
(2)如图③,在△ABC 中,BP、CP 分别是∠ABC 邻 AB 三分线和∠ACB 邻 AC 三分线, 且 BP⊥CP,求∠A 的度数;
【延伸推广】
(3)在△ABC 中,∠ACD 是△ABC 的外角,∠B 的三分线所在的直线与∠ACD 的三分线所在的直线交于点 P.若∠A=α°,∠B=β°,直接写出∠BPC 的度数.(用含 α、β 的代数式表示)
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【推荐1】如图,锐角
中,
,
是
的外接圆,
的延长线交边
于点
.
(1)求证:
;
(2)当
是等腰三角形时,求
的度数;
(3)记
、
、
的面积分别为
、
、
,且
,
①求
的值;
②求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/25/b5665f9a-a7ec-4ea5-9b00-bccda9716efb.png?resizew=377)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d240aaac1b5e07130af57c0b8c6958.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
(3)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3a3cd64a541a9bb65e9f75665d0a5f.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61f9215613b7b05217ed77268c238391.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3acf551f38311eccdcc325c0d283473.png)
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【推荐2】在
中,
,
,点
是
边上的动点(与端点
,
不重合),连接
,过点
作
,使得
,且点
,
分别在直线
的两侧,连接
交射线
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/3687d3f1-ca85-429a-a463-65c617cba945.png?resizew=381)
平分
,求证:
;
(2)在点
运动过程中,有如下三个结论:①
;②
;③
.请选出一个你认为正确的结论,并说明理由;
(3)如图2,连接
,若点
是
的中点,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec9e2a600d4675d510c58b984027e33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f94cb32b388456ab9203e8d8b5309e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/3687d3f1-ca85-429a-a463-65c617cba945.png?resizew=381)
图1 图2
(1)如图1,若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7277733875645851ba19f488fc21415d.png)
(2)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b282c521e0f3406b61964ed80f7a56bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12ccce5afabe315eeab5605fe972dfff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5609e6a0251a18d4a59a14beb3e0a344.png)
(3)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8490cab76a1a6e5cb35de8535be9be.png)
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