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菱形 |
C.任意多边形的内角和为360° |
D.三角形的中位线平行于第三边,并且等于第三边的一半 |
更新时间:2019-01-23 11:46:18
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【推荐1】如图,△ABC中,∠BAC=90°,中线AF与中位线DE相交于点O,则四边形ADFE是( )
A.平行四边形 | B.矩形 | C.菱形 | D.正方形 |
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【推荐2】顺次连结对角线相等的四边形的四边中点所得图形是( )
A.正方形 | B.矩形 | C.菱形 | D.以上都不对 |
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【推荐1】下列命题中是真命题的是( )
A.对角线互相平分的四边形是菱形 | B.对角线互相平分且相等的四边形是菱形 |
C.对角线互相垂直的四边形是菱形 | D.对角线互相垂直平分的四边形是菱形 |
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【推荐2】如图,在
中,点
、
分别是
、
的中点,
与
交于点
,
与
交于点
,下列说法:①四边形
是平行四边形;②四边形
是平行四边形;③当
时,四边形
是菱形;④当
时,四边形
是矩形,其中正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/24/5c782d37-be29-42a0-b594-b4c67b0b327f.png?resizew=191)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5406e7922357e0396a651e0cda56de93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5406e7922357e0396a651e0cda56de93.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/24/5c782d37-be29-42a0-b594-b4c67b0b327f.png?resizew=191)
A.①② | B.①②③ | C.①②④ | D.①②③④ |
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【推荐1】在矩形纸片
中,
,
,将矩形纸片沿
折叠,点B与点D恰好重合,接
,有以下结论:①
;②四边形
是菱形;③
;④
的面积是
,其中正确的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd3a9fb4d5064874d884ba49fcbf8717.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbbc174806dda6954b14923a42132d1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bc1ad4bcf786880d7da5e36ac90aaae.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图,在矩形
中,
,
相交于点
,过点
作
交
于点
,交
于点
,过点
作
交
于点
,交
于点
,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://img.xkw.com/dksih/QBM/editorImg/2022/8/28/6847fd8b-e6ad-46d0-b6e0-767a81608193.png?resizew=125)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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A.0个 | B.1个 | C.2个 | D.3个 |
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