如图,在
中,
与
的平分线交于点
,过点
作
交
于点
,交
于点
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/1674810c-e0d1-47f6-9a0f-c172115a9c36.png?resizew=134)
(1)请找出图中所有的等腰三角形,并说明理由.
(2)求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/476b0b8378f4b0f73f3dc5d84d89f616.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f186ea827f7becafd1ac4955e22c6812.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65fc998d33cdf37c272f79cfd64b7b99.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/1674810c-e0d1-47f6-9a0f-c172115a9c36.png?resizew=134)
(1)请找出图中所有的等腰三角形,并说明理由.
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
更新时间:2022-12-10 17:37:43
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,在
中,
是
的平分线,
交
于点
.
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105068b25f5a63af32f4082cfe08691e.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/b0d53c82934dd013b37e71f56fe0dbf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e61700146bdead2bddd7a439ef0e259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd1bc0388e7fad3e849ca39c67f5034.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/6fc89842-2d51-44ee-8966-f2afbf329ac4.png?resizew=135)
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解答题-证明题
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【推荐2】在
中,点
为边
的中点,过点
的动直线
可绕点
旋转,分别过点
作直线
的垂线,垂足分别为点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/94b02427-3bf5-41d2-843d-53a96e035578.png?resizew=659)
(1)当直线
经过点
时,如图1,写出线段
与
的之间的数量关系,并给出证明;
(2)当直线
旋转到如图2、图3的位置时,线段
之间分别有怎样的数量关系,写出你的结论,并给出证明.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460c70650cd64f4e9373c2120ac9a1ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6241f9ef86cd0a902cbadaf336767dbc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/94b02427-3bf5-41d2-843d-53a96e035578.png?resizew=659)
(1)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
(2)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b35a96bbf8960cf6cccfc8f0947bd9f.png)
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解答题-证明题
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(0.65)
【推荐1】在数学学习过程中,对有些具有特殊结构,且结论又具有一般性的数学问题我们常将其作为一个数学模型加以识记,以积累和丰富自己的问题解决经验.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/28/1457601d-1ae0-4ee5-8aed-fd51367c492d.png?resizew=468)
【结论发现】小明在处理教材第43页第21题后发现:三角形的一个内角平分线与另一内角的外角平分线的夹角的度数是三角形第三内角度数的一半.
【结论探究】
(1)如图1,在△ABC中,点E是△ABC内角∠ACB平分线CE与外角∠ABD的平分线BE的交点,则有∠E=
∠A请给出证明过程.
请直接应用上面的“结论发现”解决下列问题:
【简单应用】
(2)如图2,在△ABC中,∠ABC=40°.延长BA至G,延长AC至H,已知∠BAC、∠CAG的角平分线与∠BCH的角平分线及其反向延长线交于E、F,求∠F的度数;
【变式拓展】
(3)如图3,四边形ABCD的内角∠BCD与外角∠ABG的平分线形成如图所示形状.
①已知∠A=150°,∠D=80°,求∠E+∠F的度数;
②直接写出∠E+∠F与∠A+∠D的关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/28/1457601d-1ae0-4ee5-8aed-fd51367c492d.png?resizew=468)
【结论发现】小明在处理教材第43页第21题后发现:三角形的一个内角平分线与另一内角的外角平分线的夹角的度数是三角形第三内角度数的一半.
【结论探究】
(1)如图1,在△ABC中,点E是△ABC内角∠ACB平分线CE与外角∠ABD的平分线BE的交点,则有∠E=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
请直接应用上面的“结论发现”解决下列问题:
【简单应用】
(2)如图2,在△ABC中,∠ABC=40°.延长BA至G,延长AC至H,已知∠BAC、∠CAG的角平分线与∠BCH的角平分线及其反向延长线交于E、F,求∠F的度数;
【变式拓展】
(3)如图3,四边形ABCD的内角∠BCD与外角∠ABG的平分线形成如图所示形状.
①已知∠A=150°,∠D=80°,求∠E+∠F的度数;
②直接写出∠E+∠F与∠A+∠D的关系.
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解答题-问答题
|
适中
(0.65)
【推荐2】如图1,点
、
分别在射线
、
上运动(不与点
重合),
、
分别是
和
的角平分线,
延长线交
于点
.
(1)若
,则
(直接写出答案)
(2)若
,求出
的度数(用含
的代数式表示并写出理由)
(3)如图2,若
,过点
作
交
于点
,求
与
的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a457b899731577bfe61dda594ae4eec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2bc29145f6e7557711c34b443bd5e84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/1b253586-182d-4e84-b448-7e9fd08b70b6.png?resizew=320)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12aa2bb3b37f2d56a287807700d04893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d12d1752b63c6a44f6eb3e30e689d669.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee3148894e0db3624ac9826394b6e065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d890499dca9a8ef30addafe41d6e771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e35cf8256272c26989676e3d8b5b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55b293c2ed1bfdef693a3fe05b7d9f66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cb61dea01c0c17fdeb3ac9d84b1e51c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/752fa646a2d9cfca34001748445301c9.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
真题
【推荐1】如图,
中,点E是
的中点,连接
并延长交
的延长线于点F.
;
(2)点G是线段
上一点,满足
,
交
于点H,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.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/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14833dbeed409b33acd4c9071fd0be36.png)
(2)点G是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8f0f44d5995d4bb6195dd86c4909e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0914835057dfe8bd65516c2f7846d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
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【推荐2】如图,D是△ABC的边BC的中点,
,
,垂足分别是E、F,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/16/5ef1c26b-6f4a-48a3-a337-7a222d527e62.png?resizew=144)
(1)求证:△ABC是等腰三角形;
(2)若
,
,求△ABC的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa30a9ee227af2b387cf6e028c20d7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/16/5ef1c26b-6f4a-48a3-a337-7a222d527e62.png?resizew=144)
(1)求证:△ABC是等腰三角形;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
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