在
中,线段AD,AE,AF分别是
的高、中线、角平分线,以下两个结论:①若
,则点D,E,F重合;②若
,则点F总在点D,E之间,其中( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff0b137cef19125a9ff8abb89e0bdc43.png)
A.①是真命题,②是假命题 | B.①是假命题,②是真命题 |
C.①②均是假命题 | D.①②均是真命题 |
21-22八年级上·福建莆田·期末 查看更多[3]
福建省莆田市2021-2022学年八年级上学期期末数学试题福建省莆田市荔城区2021-2022学年八年级上学期期末数学试题(已下线)专题2.28 《特殊三角形》全章复习与巩固(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(浙教版)
更新时间:2022-03-17 14:40:46
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【推荐1】如图,点A,B,C在一条直线上,△ABD和△BCE是等边三角形,连接AE和CD交于点M,则∠AMC的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/cdfceb2a-3c27-4cf8-b915-33fa1a9a33a2.png?resizew=212)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/cdfceb2a-3c27-4cf8-b915-33fa1a9a33a2.png?resizew=212)
A.135° | B.120° | C.105° | D.90° |
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【推荐2】已知:如图,在
与
中,
,
,
,
、
、
三点在同一直线上,连接
、
,以下四个结论:①
,②
,③
,④
,其中正确的个数( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/e56e90a1-ff8e-4285-9690-2e657c6d535f.png?resizew=139)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/509d8dd6031dc0ef92075877e53fe201.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fbeb8bdc95779c4ea641e1100361790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52273305805769a438772342b53c289e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/e56e90a1-ff8e-4285-9690-2e657c6d535f.png?resizew=139)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】下列性质中,等腰三角形具有而直角三角形不一定具有的是 ( )
A.两边之和大于第三边 | B.有一个角的平分线垂直于这个角的对边 |
C.有两个锐角的和等于90° | D.内角和等于180° |
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【推荐2】小颖用尺规按如下步骤作图:
(1)分别以
、
为圆心,以大于
的长为半径作弧,两弧交于点
;
(2)连接
、
;
(3)以
为圆心,任意长为半径作弧,分别交
、
于
、
;
(4)分别以
、
为圆心,以大于
的长为半径作弧,两弧交于点
;
(5)连接
并延长交
与点
,得到如图,则下列结论中:①
;②
;③
;④
;⑤
.正确的有( )
(1)分别以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d49404351575703cfe8325d1352ec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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)
(4)分别以
![](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/52d092504d3c33c48be43f23b788efd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(5)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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A.5个 | B.4个 | C.3个 | D.2个 |
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【推荐1】下列命题:①成中心对称的两个图形不一定全等;②成中心对称的两个图形一定是全等图形;③两个全等的图形一定关于某点成中心对称;④中心对称表示两个图形之间的对称关系,中心对称图形是指某一个图形所具有的对称性质.其中真命题的个数是 ( )
A.1 | B.2 | C.3 | D.4 |
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【推荐2】下列命题中是真命题的是( )
A.![]() | B.若![]() ![]() |
C.垂线最短 | D.同旁内角相等,两直线平行 |
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