下列命题中正确的是( )
A.有一个角是直角的平行四边形是菱形 | B.矩形的对角线互相垂直 |
C.对角线互相平分的四边形是平行四边形 | D.四条边都相等的四边形是正方形 |
更新时间:2024-05-17 18:00:36
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【推荐1】下列说法正确的是( )
A.对角线互相垂直的四边形是菱形 |
B.四条边都相等的四边形是正方形 |
C.直角三角形斜边上的中线等于斜边的一半 |
D.有一组对边相等,一组对边平行的四边形是平行四边形 |
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【推荐2】如图,分别以
的斜边
,直角边
为边向外作等边
和
,
为
的中点,
,
相交于点
,若
,下列结论:①
;②四边形
为平行四边形;③
;④
,其中正确结论的序号是( )
![](https://img.xkw.com/dksih/QBM/2021/3/8/2673445634539520/2673522792136704/STEM/602af131f5b5443b9a777dfe55f002c1.png?resizew=150)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e08c14e87a2bcf7090eab2fea73667d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b201ea04224e66276a0e67de4c510f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce21274f911d25437d83f0e6d4eadf1f.png)
![](https://img.xkw.com/dksih/QBM/2021/3/8/2673445634539520/2673522792136704/STEM/602af131f5b5443b9a777dfe55f002c1.png?resizew=150)
A.①②④ | B.①③ | C.②③④ | D.①②③④ |
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【推荐1】如图,矩形
的顶点
、
分别在
轴、
轴上,
,
,将矩形
绕点
顺时针旋转,每次旋转
,则第
次旋转结束时,点
的坐标为( )
![](https://img.xkw.com/dksih/QBM/2021/5/8/2716625101332480/2717898605969408/STEM/2a465efb-f365-4adf-8a3e-6fa8f8c4cedf.png?resizew=215)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c20e5e01e88591113257c46fe308ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c3ec174b1ce835cc8737ff6ce57e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2021/5/8/2716625101332480/2717898605969408/STEM/2a465efb-f365-4adf-8a3e-6fa8f8c4cedf.png?resizew=215)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在矩形
中,有以下结论:①
;②
;③
是等腰三角形;④
;⑤
;⑥
能使矩形
变成正方形.正确结论的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/50c8d90c-40d0-4ac8-b435-51cc46f4f113.png?resizew=186)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6631aeacf1e907b8d22a4d81fbf8289.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b03bf58cba56d1b98a8a457982870b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/50c8d90c-40d0-4ac8-b435-51cc46f4f113.png?resizew=186)
A.2 | B.3 | C.4 | D.5 |
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【推荐1】如图,在平行四边形
中,按以下步骤作图:①分别以点B,D为圆心,以大于
的长为半径画弧,两弧分别交于E,F两点;②连接
,分别交
,
于点M,N,连接
,
,则四边形
一定是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/29/28256284-4ae0-4243-a40a-475ae759300c.png?resizew=157)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c81613520ab5a478f0b2616a9bcb79d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408e2d26c0c8a6594c4baba496a4651d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/29/28256284-4ae0-4243-a40a-475ae759300c.png?resizew=157)
A.矩形 | B.菱形 | C.正方形 | D.无法判断 |
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【推荐2】如图,在矩形
中,
相交于点O,过点B作
交
于点F,交
于点M,过点D作
交
于点E,交
于点N,则下列结论:①
;②
;③当
时,四边形
是菱形.其中,正确结论的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989c75a3fd02e4971cab421c88de92f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2a245381e615882ee5feb7793a1df6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3139e28714bfc3d5d875d78dd245d2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0379a2a83e0b10c67e53dec1e7c52872.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75edb3996fbf4e47c6065d81adf69d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47dfbfbfadf86c6ca8363a93b5157c99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f3c15b30bd155641e548a7d8c172dd4.png)
A.0个 | B.1个 | C.2个 | D.3个 |
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【推荐1】下列命题:(1)一个三角形的各边长扩大为原来的9倍,这个三角形的面积也扩大为原来的9倍(2)相等的圆心角所对的弦相等(3)对角线相等且互相垂直的四边形是正方形(4)经过直线外一点有且只有一条直线与这条直线平行,其中真命题的个数有( )
A.4个 | B.3个 | C.2个 | D.1个 |
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真题
【推荐2】下列命题是真命题的是( )
A.对角线相等的四边形是矩形 |
B.对角线互相垂直的四边形是矩形 |
C.对角线互相垂直的矩形是正方形 |
D.四边相等的平行四边形是正方形 |
您最近一年使用:0次