如图,
( )
![](https://img.xkw.com/dksih/QBM/2020/4/27/2450609659977728/2453219551485952/STEM/2bfddd8766e64e4d9f3a9b6b1c70fd41.png?resizew=197)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcf1305e02fd517a029964804357b472.png)
![](https://img.xkw.com/dksih/QBM/2020/4/27/2450609659977728/2453219551485952/STEM/2bfddd8766e64e4d9f3a9b6b1c70fd41.png?resizew=197)
A.![]() | B.![]() | C.![]() | D.![]() |
18-19七年级下·吉林长春·期中 查看更多[3]
吉林省长春市解放大路学校2018-2019学年七年级下学期期中数学试题(已下线)专题11.15 多边形内角和与外角和(巩固篇)(专项练习)-2022-2023学年八年级数学上册基础知识专项讲练(人教版)(已下线)11.3 多边形的内角和与外角和(培优三阶练)-2022-2023学年八年级数学上册课后培优分级练(人教版)
更新时间:2020-05-03 16:10:59
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【推荐1】如图,在
中,
,
的外角平分线
与内角平分线
的延长线交于点
,过点
作
交
延长线于点
,连接
,点
为
中点.有下列结论:①
;②
;③
;④
;⑤
.其中正确的个数有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/ffa1453d-3f7d-4cd7-8ba0-dde192d3d46a.png?resizew=282)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.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/6d276d0010fd458383ea3dd61415e1aa.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d57a399b02a02f65cd6d224825aea23.png)
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A.5 | B.4 | C.3 | D.2 |
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【推荐2】小明将含
的三角板和一把直尺如图放置,测得
,则
的度数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/8436dd0c-0413-4382-ac51-e6493a481253.png?resizew=140)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c030b25575d683af91c06e6a3e4f463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d660c35fc327081bdd306aad0b35317f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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真题
【推荐1】如图所示,小华从A点出发,沿直线前进10米后左转
,再沿直线前进10米,又向左转
,
,照这样走下去,他第一次回到出发地A点时,一共走的路程是( )
![](https://img.xkw.com/dksih/QBM/2018/7/23/1994867043074048/1996272317579264/STEM/756285ffade64573b810017b47ccec9b.png?resizew=148)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff83389ad32a6896016125934569d980.png)
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A.200米 | B.180米 | C.160米 | D.140米 |
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【推荐2】下面说法正确的个数有( )
①若m>n,则ma2>na2;
②由三条线段首尾顺次连接所组成的图形叫做三角形;
③如果△ABC的三个内角满足∠A=∠C﹣∠B,那么△ABC一定是直角三角形;
④任意的多边形的外角和都等于360°;
⑤如果一个三角形只有一条高在三角形的内部,那么这个三角形一定是钝角三角形.
①若m>n,则ma2>na2;
②由三条线段首尾顺次连接所组成的图形叫做三角形;
③如果△ABC的三个内角满足∠A=∠C﹣∠B,那么△ABC一定是直角三角形;
④任意的多边形的外角和都等于360°;
⑤如果一个三角形只有一条高在三角形的内部,那么这个三角形一定是钝角三角形.
A.1个 | B.2个 | C.3个 | D.4个 |
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