我们把顺次连接四边形各边中点所得的四边形叫做中点四边形.若一个任意 四边形的面积为a,则它的中点四边形面积为( )
A.![]() | B. ![]() | C.![]() | D.![]() |
更新时间:2020-05-21 10:14:02
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【推荐1】如图,过边长为1的等边△
的边
上一点
,作
于点
,
为
延长线上一点,当
时,连接
交
边于点
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/2019/10/28/2321600720568320/2324758110404608/STEM/45d3efe3c3844de0995d3cf8a315a18d.png?resizew=169)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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A.1 | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在等腰
中,
,
是斜边
的中点,
交边
、
于点
、
,连结
,且
,若
,
,则
的面积是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/0326141c-8273-4d4b-964b-d6ce9593fefb.png?resizew=159)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87fd28b8b2bde9de5630a6106a6f762e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
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A.2 | B.2.5 | C.3 | D.3.5 |
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【推荐1】如图,在
中,∠A=70°,
,以点B为旋转中心把
按顺时针旋转一定角度,得到
,点
恰好落在
上,连接
,则
度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/42d7b270-84a1-429a-9788-51d8c0d7ae78.png?resizew=148)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cf39c4552ecb2b659f052dc5c0f5eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在四边形
中,对角线
垂直平分
.关于四边形
的形状,下列说法不正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
A.若![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() |
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【推荐1】如图,
中,
和
的平分线相交于中位线
上的一点P,若
,
,
,则
的周长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
A.3 | B.6 | C.9 | D.1.5 |
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【推荐2】如图,在
中,D,E分别是
,
的中点,
,F是
上一点,连接
,
,
,若
,则
的长度是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/26/93278cac-1f2c-4eac-88cd-d2d48a693377.png?resizew=203)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10787ce380382dfd1cf02255a623d80b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/26/93278cac-1f2c-4eac-88cd-d2d48a693377.png?resizew=203)
A.4 | B.5 | C.8 | D.12 |
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