在菱形
中,
,
,点E是
边的中点,点M是
边上一动点(不与点A重合),连接
并延长交射线
于点N,连接
、
,
![](https://img.xkw.com/dksih/QBM/2021/10/27/2838319986204672/2838384864010240/STEM/45e190fa97a441d4af051d6bdbd39c3a.png?resizew=188)
(1)求证:四边形
是平行四边形;
(2)当
_______时,四边形
是矩形;
(3)四边形
能否成为菱形?若能,求出
的值,若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://img.xkw.com/dksih/QBM/2021/10/27/2838319986204672/2838384864010240/STEM/45e190fa97a441d4af051d6bdbd39c3a.png?resizew=188)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04a6fa5218491da01843cdfde0c3dcbd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1039601edd7326b628a3201a3d4af948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04a6fa5218491da01843cdfde0c3dcbd.png)
(3)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04a6fa5218491da01843cdfde0c3dcbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
更新时间:2021-10-27 14:51:42
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】在矩形
中,将点A翻折到对角线
上的点M处,折痕
交
于点E.将点C翻折到对角线
上的点N处,折痕
交
于点F.
为平行四边形;
(2)连接
,若
,且
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87e1fe20bb0e8292e993657e14bc79a.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c672f693a7e75a7bae4936dcb1920430.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,过四边形
的四个顶点分别作对角线
、
的平行线,围成四边形
.
是平行四边形;
(2)当四边形
满足______时,四边形
是菱形(不用证明);
(3)当四边形
满足______时,四边形
是矩形,请予以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
(2)当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
(3)当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,已知平行四边形ABCD的对角线AC,BD相交于点O,AC=20 cm,BD=12 cm,两动点E,F同时以2 cm/s的速度分别从点A,C出发在线段AC上相对运动,点E到点C,点F到点A时停止运动.
(1)求证:当点E,F在运动过程中不与点O重合时,以点B,E,D,F为顶点的四边形为平行四边形;
(2)当点E,F的运动时间t为何值时,四边形BEDF为矩形?
(1)求证:当点E,F在运动过程中不与点O重合时,以点B,E,D,F为顶点的四边形为平行四边形;
(2)当点E,F的运动时间t为何值时,四边形BEDF为矩形?
![](https://img.xkw.com/dksih/QBM/2018/7/18/1990944678813696/null/STEM/1945e1b9e441477c812bc04ebe02c4e6.png?resizew=206)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在平行四边形
中,点E,F在对角线
所在直线上,
.
;
(2)连
,
.请添加一个条件,使四边形
为矩形,并需要说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65fb624bcae7cf99ce00e0712f0fd892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
(2)连
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87e1fe20bb0e8292e993657e14bc79a.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在四边形
中,
,
分别是边
上的点,连接
交于点
,
.添加下列条件之一使四边形
成为菱形:①
;②
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/be6b96ec-94ca-4866-90d4-ee5feebeb584.png?resizew=162)
(1)你添加的条件是______(填序号),并证明.
(2)在(1)的条件下,连接
,若
,求菱形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76b7b36b6a579bc27c509ca918f07ff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eceff9b68796f5ccd4daa4028e3a182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf22927eb6819a02978ef0c6b101f6f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac679f877d3e3b3acef1f1f8e3654b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da992cfc72ab89d269327890388f639.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/be6b96ec-94ca-4866-90d4-ee5feebeb584.png?resizew=162)
(1)你添加的条件是______(填序号),并证明.
(2)在(1)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/719ebc95ae223dde49e47a8cb1a0381a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在
中,D是
边上的一点,
是
的中点,过
点作
的平行线交
的延长线于点
,且
,连接
.
(1)线段
与
有什么数量关系,并说明理由;
(2)当
满足什么条件时,四边形
是菱形?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8e8b8dc232a88228f377b7782db172.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/23/5e824981-2f85-4940-8a83-17b605c2796a.png?resizew=171)
(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778d541d9b66dde2f944dca7f93d6b67.png)
您最近一年使用:0次