1 . 如图,在△ABC中,AB=AC,D、E分别在边AB、AC上,DE//BC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/3277d4bf-3ee9-4d61-bdf6-c01d5614ac55.png?resizew=150)
(1)试问△ADE是否是等腰三角形,并说明理由.
(2)若M为DE上的点,且BM平分
,CM平分
,若
的周长为20,BC=8.求
的周长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/3277d4bf-3ee9-4d61-bdf6-c01d5614ac55.png?resizew=150)
(1)试问△ADE是否是等腰三角形,并说明理由.
(2)若M为DE上的点,且BM平分
![](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/27c9a77f3dcaacefe3ee0a64ddf7f73a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
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2018-01-02更新
|
310次组卷
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6卷引用:甘肃省金昌市龙门学校2021-2022学年八年级上学期期末考试数学试题
甘肃省金昌市龙门学校2021-2022学年八年级上学期期末考试数学试题重庆市望江中学2016-2017学年八年级(上)期中数学试卷重庆市江津区2017-2018学年八年级上学期第二次六校联考数学试题内蒙古通辽市奈曼旗第二中学2020-2021学年八年级上学期期中数学试题(已下线)(培优特训)专项1.1 等腰三角形综合应用-2022-2023学年八年级数学下册《同步考点解读·专题训练》(北师大版)(已下线)第一次月考(阶段性测试)模拟测试卷-2022-2023学年八年级数学下册《同步考点解读·专题训练》(北师大版)
2 . 如图,△ABC中,∠C=90°,∠ABC=60°,BD平分∠ABC,则∠CDB=_____ 度.
![](https://img.xkw.com/dksih/QBM/2019/8/12/2267160115814400/2268106341269504/STEM/c02cc9605ff64b61b999827d11c41e6b.png?resizew=152)
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2019-08-13更新
|
196次组卷
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2卷引用:甘肃省兰州市2019-2020学年九年级下学期一诊数学试题
3 . 已知△ABC中,∠ABC和∠ACB的平分线交于点O,则∠BOC一定( )
A.小于直角 | B.等于直角 | C.大于直角 | D.不能确定 |
您最近一年使用:0次
2016-12-12更新
|
442次组卷
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6卷引用:2015-2016学年甘肃省武威市四中八年级上学期第一次月考数学试卷
4 . 下列命题:①三角形的三边长确定后,三角形的形状就唯一确定②三角形的角平分线,中线,高线都在三角形的内部;③全等三角形面积相等,面积相等的三角形也全等.其中假命题是( )
A.1 | B.2 | C.3 | D.0 |
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5 . 对于下面每个三角形,过顶点A作出三角形的中线、角平分线和高.
![](https://img.xkw.com/dksih/QBM/2017/9/13/1773342126768128/1773349651775488/STEM/4ae6e8b608eb4b28af8bf6c31aa2a91c.png?resizew=484)
您最近一年使用:0次
2017-09-13更新
|
144次组卷
|
2卷引用:甘肃省武威第五中学2016-2017学年八年级上学期第一次月考数学试题
6 . 如图,在
中,
平分
,
于点
,
交
于点
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/404728d0ea2699c71e674f30dd984abd.png)
_____ .
![](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/650c6c818df102a83ce5159e3208d01a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca14fa885a9d04f04e0418b49b118241.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/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/404728d0ea2699c71e674f30dd984abd.png)
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7 . 完成下面的证明:已知,如图,
,
平分
,
平分
.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04817cf2cba43ebe082c2014113d44b8.png)
证明:∵
(已知)
∴
______
又∵
(已知)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1f1eb88908212022226705b38885275.png)
∵
(已知)
∴
______
又∵
平分
(已知)
∴
____________
又∵
平分
(已知)
∴
____________
∴
(________)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bc6da80c5843d23ee18f3dfb709849d.png)
∴
______即
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2969cce3974886f30419d75428f59be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2ee75a234ac05a3225e49ddd8c5065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2055364f2aba7dc5aefa0c9f91077c63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04817cf2cba43ebe082c2014113d44b8.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39cc43ff546b95c86a95b1226139d062.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e50ce9ef89a466df68124a1dccff5663.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab6964dea0ae349e60bcef99b1b0bc2.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1f1eb88908212022226705b38885275.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/584a66ad4efa99961a02d42e4d821a29.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2ee75a234ac05a3225e49ddd8c5065.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aaa8dbb7a8f583d02908155204dfb19.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f68e4414c9ab464bf433385c03705f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0247394296e9c9b8e4e484d4ad52ef45.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf09ba65c8cfd4a12033a033775b317.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bc6da80c5843d23ee18f3dfb709849d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/046cb90bd0747de81de595c30e7f5d78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04817cf2cba43ebe082c2014113d44b8.png)
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8 . 如图,点C,D在直线
上,
.
;
(2)若
,
的角平分线
交
于点G,过点F作
交
的延长线于点M.若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22facbd7894b1dcaf6a985e99f33f025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ad49ce2fe9dc1b61c05be7bde2ed24.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b25eff69a4a0dc7a7ab183843303d333.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/565dbc999d29f33f73ad882df0a97e23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2be5713fc62fc4c4620c1b96568d13ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dd9e9f7a02f51d6c069b55aa8543cbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f34868b311f1082fb003dec7f07cdfd2.png)
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