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18-19八年级上·全国·单元测试 查看更多[2]
更新时间:2018-11-03 23:27:12
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【知识点】 与角平分线有关的三角形内角和问题解读
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】在四边形ABCD中,∠A=140°,∠D=80°.
![](https://img.xkw.com/dksih/QBM/2022/7/11/3020325600780288/3024695711653888/STEM/fb92e20858b945a6b9136f84762c20cc.png?resizew=453)
(1)如图1,若∠B=∠C,求∠C的度数;
(2)如图2,若∠ABC的角平分线BE交DC于点E,且BE
AD,求∠C的度数;
(3)如图3.
①若BE、CF分别是∠ABC和∠BCD的角平分线,BE、CF交于点O,求∠BOC的度数,并探究∠BOC与∠A,∠D之间的数量关系,写出你的结论.(不必写理由)
②若BE⊥DC于点E,CF⊥AB于点F,BE、CF交于点O,探究∠BOC与∠A,∠D之间的数量关系,写出你的结论.(不必写理由)
![](https://img.xkw.com/dksih/QBM/2022/7/11/3020325600780288/3024695711653888/STEM/fb92e20858b945a6b9136f84762c20cc.png?resizew=453)
(1)如图1,若∠B=∠C,求∠C的度数;
(2)如图2,若∠ABC的角平分线BE交DC于点E,且BE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(3)如图3.
①若BE、CF分别是∠ABC和∠BCD的角平分线,BE、CF交于点O,求∠BOC的度数,并探究∠BOC与∠A,∠D之间的数量关系,写出你的结论.(不必写理由)
②若BE⊥DC于点E,CF⊥AB于点F,BE、CF交于点O,探究∠BOC与∠A,∠D之间的数量关系,写出你的结论.(不必写理由)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在
中,
是
边上的高,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/6c31074a-4120-47e9-a7b0-0c8d9baac319.png?resizew=136)
(1)
;
(2)若
平分
交
于点
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b1164750466d461f0a415d3a6407589.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/6c31074a-4120-47e9-a7b0-0c8d9baac319.png?resizew=136)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d715af2d0f55f1f8855361afee3fd0f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca9da79f161893264fd3c9f2d5ca99bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
您最近一年使用:0次