如图,四边形
为矩形,四边形
为菱形.
![](https://img.xkw.com/dksih/QBM/2018/10/3/2045444494352384/2055806531502080/STEM/4f810d25ea2745c297156d76965ac325.png?resizew=101)
求证:
;
试探究:当矩形
边长满足什么关系时,菱形
为正方形?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/015572e6a2862542050c335211b3d0f2.png)
![](https://img.xkw.com/dksih/QBM/2018/10/3/2045444494352384/2055806531502080/STEM/4f810d25ea2745c297156d76965ac325.png?resizew=101)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d46a1852e7bcbf7eed88c5aa11fda5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/015572e6a2862542050c335211b3d0f2.png)
更新时间:2018-10-17 22:52:00
|
【知识点】 根据正方形的性质与判定证明
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
是
的直径,点C是
上一点,
的角平分线
交直径
于点E,交
于点D,过点D作
,交
的延长线于点F.
与
相切于点D;
(2)若
,
,求
的长;
(3)若
,求
的半径的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/100b3e7dcd5f34c5234971cd75bff138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66848223a2f901d5cd78b98efa1e985b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图1,在正方形
中,点E为
边上任意一点(点E不与B,C重合),点F在线段
上,过点F的直线
,分别交
,
于点M,N.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/21ba45e5-d3ce-4706-80a1-a2ae94ef1738.png?resizew=388)
(1)求证:
;
(2)如图2,当点F为
中点时,其他条件不变,连接正方形的对角线
,
与
交于点G,连接
,求证:
;
(3)如图3,当点E为
延长线上的动点时,如果(2)中的其他条件不变,直线
分别交直线
,
于点M,N,结论“
”还成立吗?如果成立,请证明:如果不成立,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13c4a875c62b36bcc95d629b780d8ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/21ba45e5-d3ce-4706-80a1-a2ae94ef1738.png?resizew=388)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc77bde58cab23c53d53733c505115f9.png)
(2)如图2,当点F为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1daf6086ccfe0d8ad065cec6a1ac7fed.png)
(3)如图3,当点E为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.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/1daf6086ccfe0d8ad065cec6a1ac7fed.png)
您最近一年使用:0次