如图,是一张平行四边形纸片ABCD,要求利用所学知识将它变成一个菱形,甲、乙两位同学的作法分别如下:对于甲、乙两人的作法,正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/36fae732-6aac-45ac-bc68-efb8a0f08eaf.png?resizew=594)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/36fae732-6aac-45ac-bc68-efb8a0f08eaf.png?resizew=594)
A.甲对 | B.乙对 | C.甲、乙都对 | D.甲、乙都不对 |
更新时间:2022-07-07 07:52:54
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【推荐1】如图,在
ABC中,∠C=90°,∠B =30°,以点A为圆心,任意长为半径画弧,分别交AB、AC于点M,再分别以点M、N为圆心,大于MN的一半为半径画弧,两弧交于点P,连接AP并延长交BD于点D,则下列说法正确的是( )
①AD是
的平分线;②
;③
;④![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0a93b39ae22d448e1d3bb7922a5be4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
①AD是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a58a622e2b1a239f2f96aa1501e9799.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0a93b39ae22d448e1d3bb7922a5be4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/4c675877-6894-42d3-96f0-deb749946ca7.png?resizew=196)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图,在
中,
,由图中的尺规作图痕迹得到的射线
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交于点E,点F为
的中点,连接
,若
,则
的周长为( )
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,在
中,分别以点
和点
为圆心,大于
的长为半径作弧,两弧相交于
、
两点,连接
,交
于点
,以点
为圆心,
的长为半径作的弧恰好经过点
,以点
为圆心,
的长为半径作弧交
于点
,连接
,若
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( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b5c0e0724cce5c25a88dca5e9220c2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/21/417a00d6-915f-4022-904d-1a4d57fa4918.png?resizew=138)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在
中,
,下列尺规作图,不能得到
的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,
、
在
的对角线
上,
,
,
,则
的大小为( )
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A.9° | B.18° | C.27° | D.36° |
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【推荐2】在
中
.
是
上一点,
平分
,且
是
的中点,则下列结论:①
;②
;③
;④
,其中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/30/77d35a21-fb4f-44b7-a7cd-30a20410ddb6.png?resizew=209)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a320a6a242be91347d1b241f6313251.png)
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A.①② | B.②④ | C.③④ | D.①②④ |
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【推荐1】如图,ABCD是一张平行四边形纸片,要求利用所学知识作出一个菱形,甲、乙两位同学的作法如下:
则关于甲、乙两人的作法,下列判断正确的为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/14/0b77900a-6b74-4873-a25f-9ef9685afe5d.png?resizew=582)
则关于甲、乙两人的作法,下列判断正确的为( )
A.仅甲正确 | B.仅乙正确 | C.甲、乙均正确 | D.甲、乙均错误 |
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【推荐2】在平面中,下列命题为真命题的是
A.四个角相等的四边形是矩形 | B.对角线垂直的四边形是菱形 |
C.对角线相等的四边形是矩形 | D.四边相等的四边形是正方形 |
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