下列四个命题是真命题个数是( )
①等腰三角形两腰上的高相等;②等腰三角形的高、中线、角的平分线是同一条线段;③一组对边平行、一组对角相等的四边形是平行四边形;④斜边和一条直角边对应相等的两个直角三角形全等.
①等腰三角形两腰上的高相等;②等腰三角形的高、中线、角的平分线是同一条线段;③一组对边平行、一组对角相等的四边形是平行四边形;④斜边和一条直角边对应相等的两个直角三角形全等.
A.1 | B.2 | C.3 | D.4 |
更新时间:2023-09-07 19:58:34
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【推荐1】如图,在
中,
的平分线交
于点
,过点
分别作
,
,垂足分别为
,
,连接
.有下列四个结论:①
;②
垂直平分
;③
;④
.其中一定正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/28/f0ed9c23-c006-4992-819b-7c2aa16b8681.png?resizew=127)
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A.①②③ | B.①③④ | C.①②④ | D.②③④ |
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【推荐2】如图,在四边形
中,
,若
的角平分线
交
于
,连接
,且
平分
,则下列结论:①
;②
为
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;④
其中正确的是( )
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A.①②③ | B.①③④ | C.②③④ | D.①②③④ |
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在对角线
上,且
与边
相切,点
是
与线段
的交点,如果
是既与
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的两条边相切,那么关于
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的方程是( )
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A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】如图,
为
的对角线,
,
于
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于
,
、
相交于
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交线段
的延长线于
,下面结论:①
;②
;③
;④
,正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/9/9/2804609307033600/2805865728958464/STEM/a132b673-b8d9-48d7-b7fd-9e2f431c539e.png)
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A.①②③④ | B.①②③ | C.①②④ | D.①③④ |
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【推荐1】如图,E是
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交
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为平行四边形的是( )
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【推荐2】下列命题的逆命题正确的是( )
A.平行四边形的两组对边分别平行 |
B.对顶角相等 |
C.矩形是平行四边形 |
D.正方形的四条边相等 |
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