如图,已知点
,
分别在
的边
,
上,
.
![](https://img.xkw.com/dksih/QBM/2021/1/22/2641727286484992/2646113488478208/STEM/e25b9ff5-c042-4e55-b665-3b7ec00e673b.png)
(1若
,
,求
的度数:
(2)若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](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/2e210c9698063925ad2df6b6c1749571.png)
![](https://img.xkw.com/dksih/QBM/2021/1/22/2641727286484992/2646113488478208/STEM/e25b9ff5-c042-4e55-b665-3b7ec00e673b.png)
(1若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2e30ffe627436f57ecf46b89c57bb21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7582985d6849ba036eee524e35d968db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee1976ec6ffcdb15c655334d1723a119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb2091bab27f3fe6713527c61f7d4bdc.png)
更新时间:2021-01-28 23:14:35
|
【知识点】 三角形的外角的定义及性质解读
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
中,
,在
的延长线上取点
,在
上取点
、
,连接
、
,
交
于点
,已知
.
(1)如图1,求证:
;
(2)如图2,若
,连接
,
,求证:
;
(3)如图3,在(2)的条件下,延长
至点
,连接
,使
,且
,若
,求
长.
![](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/9abaeba15f3abdd877bc701af52c5cd9.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e7ba2a6a117d86de752799a4e70ba34.png)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/16/9733501d-c7d9-4cc4-9c3d-06691170fbd2.png?resizew=153)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/574880b22680065d73df733526e4c5f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc046475dbbc9dfb404539c6d2f7b6c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc180eda08edfb6d54eb04da7741f099.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/16/049327a7-3000-4663-915f-682d8a4a9b8e.png?resizew=152)
(3)如图3,在(2)的条件下,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4430d9fbe0704a98edf2ca1a98aa51fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/461e9c61894db65e03ccc3f3d6808527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71e66ea56eae094f454f714d8972078.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/16/606a6b02-9b70-4d24-b3ca-85380cec3c69.png?resizew=153)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图(1),四边形
中,
,点E是线段
上一点,
(1)说明:
;
(2)如图(2),当
平分
,
.
①说明:
;
②如图(3)若
的平分线与
的延长线交于点F,且
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(1)说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b272c4372b125b7025a86ea1c7e0e8.png)
(2)如图(2),当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9285d2f630ff8a4c58ff3504fee334ba.png)
①说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/965b770fe825b8967fa3a86f08a53a5a.png)
②如图(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4c644552971b3cd35d40ae732407baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
您最近一年使用:0次