如图,在四边形中,
,
,E、F是
上的两动点,且
,点E从点B出发,当点F移动到点C时,两点停止运动.在四边形
形状的变化过程中,依次出现的特殊四边形是( )
A.平行四边形→菱形→矩形→平行四边形 |
B.平行四边形→菱形→正方形→平行四边形 |
C.平行四边形→菱形→正方形→菱形 |
D.平行四边形→矩形→菱形→平行四边形 |
更新时间:2024-03-28 10:21:48
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【推荐1】如图,正方形
的边长为4,
为
上一点,连接
,
于点
,连接
,若
,则
的面积为( )
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A.5 | B.6 | C.7 | D.8 |
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【推荐2】已知矩形
的对角线
、
相交于点O,
,
,延长
至点E,使得
,连接
交
于点F,则
的长度为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4312c59b170d3f1f11abb896195f22b5.png)
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【推荐1】已知四边形
的对角线
相交于点
,下列条件中,不能判定四边形
是平行四边形的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
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A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】如图,在
中,以各边为边分别作三个等边三角形
,
,
,若
,
,
,则下列结论:①
;②四边形
是平行四边形;③
;④
,其中正确的有( )
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A.4个 | B.3个 | C.2个 | D.1个 |
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【推荐1】如图,在四边形ABCD中,
,
,AC,BD交于点O.关于四边形ABCD的形状,甲、乙、丙三人的说法如下:
甲:若添加“
”,则四边形ABCD是菱形;
乙:若添加“
”,则四边形ABCD是矩形;
丙:若添加“
”,则四边形ABCD是正方形.
则说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/27a60b28-9a5a-44fe-967c-8ba8f4c08dad.png?resizew=248)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4009aa13093cc3865dcd51b371892160.png)
甲:若添加“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
乙:若添加“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
丙:若添加“
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则说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/27a60b28-9a5a-44fe-967c-8ba8f4c08dad.png?resizew=248)
A.甲、乙 | B.甲、丙 | C.乙、丙 | D.甲、乙、丙 |
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【推荐2】如图,在
中,点D,E,F分别在边
,
,
上,且
,
.下列四种说法:
是平行四边形;
②如果
,那么四边形
是矩形
③如果
平分
,那么四边形
是菱形;
④如果
,且
,那么四边形
是菱形.
其中,正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a61d8bedef61745ee4fd89a8c0c119.png)
②如果
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a61d8bedef61745ee4fd89a8c0c119.png)
③如果
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a61d8bedef61745ee4fd89a8c0c119.png)
④如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
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其中,正确的有( )
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】下列说法:①函数
的自变量
的取值范围是
;②对角线相等的四边形是矩形;③正六边形的中心角为
;④对角线互相平分且相等的四边形是菱形;⑤计算
的结果为7:⑥相等的圆心角所对的弧相等;⑦
的运算结果是无理数.其中正确的个数有( )
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A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】下列命题中,不正确的是( )
A.对角线互相垂直平分的四边形是正方形 |
B.有一组邻边相等的平行四边形是菱形 |
C.有一个角是直角的平行四边形是矩形 |
D.两组对边相等的四边形是平行四边形 |
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