某数学兴趣小组在学习了“多边形内角和与外角和”后深入思考,继续探究多边形的一个外角与它不相邻的内角之和具有的数量关系.
与
,
之间的数量关系为______.若
,
,则
______.
(2)如图2,
是四边形ABCD的外角,求证:
.
(3)若n边形的一个外角为
,与其不相邻的内角之和为
,则x,y与n的数量关系是______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bc8e50eeccced1d7f3bc52e09a7d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d777d15cd733338ecfd0ea63819f62c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ece5e446ea7290e104ea161b1f3f525.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/459459559720ab5e154a80723c47cc30.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d29e7c4d6216690152430b09f9cf0c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9694c5b123773658c1e0789eabe41de.png)
(3)若n边形的一个外角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f73cc689ae54d9209aa1d03086f38945.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91d136e09a41e656f6ed3925a4405112.png)
22-23八年级下·河北保定·期末 查看更多[6]
河北省保定市安新县2022-2023学年八年级下学期期末数学试题B卷(已下线)专题07 三角形(十二大题型)-【好题汇编】备战2023-2024学年八年级数学上学期期末真题分类汇编(山东专用)(已下线)第六章第04讲 多边形的内角和与外角和(7类热点题型讲练)-【帮课堂】2023-2024学年八年级数学下册同步学与练(北师大版)(已下线)专题6.9 多边形的内角和与外角和(分层练习)-2023-2024学年八年级数学下册基础知识专项突破讲与练(北师大版)(已下线)七年级数学期末必刷题02(常考题,50题22种题型)-2023-2024学年七年级数学下学期期末考点大串讲(苏科版)(已下线)专题09 三角形的中位线与多边形的内角和、外角和(9大题型+优选提升题)-备战2023-2024学年八年级数学下学期期末真题分类汇编(北师大版)
更新时间:2023-12-09 15:46:46
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解答题-证明题
|
适中
(0.65)
【推荐2】(1)如图1,在直角三角形
中,
,
,
平分
,点E是
边上一点,且
,则
____________°;
(2)如图2,若
为一般三角形
,
,
平分
,点E是
边上一点,且
,求
的度数(用含
的代数式表示);
(3)如图3,若
为钝角三角形(
为钝角,
),
,
平分
,点E是
延长线上一点,且
,请问(2)中的结论是否还成立?如果成立请给出证明;如果不成立,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41a75ca518fd7bfdf47b6bb49ad1537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9454959fd953ac3d66f2a325a553f432.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef7914a5289110ac8623c9ed2b1d013a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597ce705d3a2fe04d29de9e81ec6250d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41a75ca518fd7bfdf47b6bb49ad1537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384d0a02d097ac7aa8a19e8da6f9767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(3)如图3,若
![](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/e550433e482b210f72d8a71fa4e186b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597ce705d3a2fe04d29de9e81ec6250d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41a75ca518fd7bfdf47b6bb49ad1537.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/4/cbfc1641-b14e-42f7-80d1-96c3b321813c.png?resizew=500)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】已知一个多边形的边数为m,它的内角和是外角和的3倍;另一个多边形的边数为n,经过它的一个顶点可作4条对角线.求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86aa790c0aa27966385cdb7e3c8cb13b.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐2】已知一个
边形的每一个外角都等于
.
(1)该
边形是否一定是正
边形?______;(填“一定是”或“不一定是”)
(2)求这个
边形的内角和;
(3)从这个
边形的一个顶点出发,可以画出______条对角线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
(1)该
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)求这个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)从这个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次