在矩形
中,
于点
,点
是边
上一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/9e6e042a-cd69-4f69-84f4-27f803eaf1f1.png?resizew=404)
(1)若
平分
,交
于点
,PF⊥BD,如图(1),证明四边形
是菱形;
(2)若
,如图(2),求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/9e6e042a-cd69-4f69-84f4-27f803eaf1f1.png?resizew=404)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35661e8c4e7a85d4d923402b479b748b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f22f74a1995a5b5fa2a0536606ce1df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a80b7c20ad35e3b5d2692921a9e39c6.png)
更新时间:2021-09-06 20:41:11
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】已知:如图,将两个全等的等腰三角形△ABC和△FDE放置在直线l两侧,AB=AC,FD=FE,连接AE,BF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/97250dec-9600-4fb5-863e-83efc42ac505.png?resizew=212)
(1)求证:四边形ABFE是平行四边形;
(2)将△ABC沿直线l向左平移,填空:
①当点B与点D重合,且四边形ABFC是正方形时,则∠BAC的度数为______;
②当点C与点D重合,且四边形ABFE是矩形时,则∠BAC的度数为______.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/97250dec-9600-4fb5-863e-83efc42ac505.png?resizew=212)
(1)求证:四边形ABFE是平行四边形;
(2)将△ABC沿直线l向左平移,填空:
①当点B与点D重合,且四边形ABFC是正方形时,则∠BAC的度数为______;
②当点C与点D重合,且四边形ABFE是矩形时,则∠BAC的度数为______.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,矩形
中,
为
上一点,把
沿
翻折,点
恰好落在
边上的点
处.
![](https://img.xkw.com/dksih/QBM/2023/1/15/3153512282939392/3163226574733312/STEM/69bd1cc79fad4f5eaf0b154c06256ce9.png?resizew=136)
(1)求证:
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2023/1/15/3153512282939392/3163226574733312/STEM/69bd1cc79fad4f5eaf0b154c06256ce9.png?resizew=136)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/884d06413db0b477e8aaf423467f5769.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐1】如图,在锐角△ABC内部作出一个菱形ADEF,使∠A为菱形的一个内角,顶点D、E、F分别落在AB、BC、CA边上.(要求:尺规作图,不写作法,保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/2021/12/14/2872097830199296/2878501047033856/STEM/2dea900f59b346178534c54d4aa6dbd1.png?resizew=188)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图在平行四边形
中,
是
的中点,过
作
分别交
、
于点
,
,连接
,
.
是菱形;
(2)若
平分
,且
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f0df3d5703b3c192d54956b1464fe13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faffe3765c15f53305516895aa595a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】数学活动课上,老师让同学们根据下面情境提出问题并解答.问题情境:在平行四边形
中,点P是边
上一点,将
沿直线
折叠,点D的对应点为E.
数学思考:
![](https://img.xkw.com/dksih/QBM/2023/4/12/3214840831221760/3215397512626176/STEM/bdb68c8794234ab0ab59578238d62f52.png?resizew=476)
(1)“兴趣小组”提出的问题是:如图1,若点P与点A重合,过点E作
,与
交于点F,连接
,则四边形
是菱形.请你证明“兴趣小组”提出的问题;
拓展探究:
(2)“智慧小组”提出的问题是:如图2,当点P为
的中点时,延长
交
于点F,连接
.试判断
与
的位置关系,并说明理由;
问题解决:
(3)“创新小组”在前两个小组的启发下,提出的问题是:如图3,当点E恰好落在
边上时,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36aae82d53f2a35d2f95f467bd5b76cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
数学思考:
![](https://img.xkw.com/dksih/QBM/2023/4/12/3214840831221760/3215397512626176/STEM/bdb68c8794234ab0ab59578238d62f52.png?resizew=476)
(1)“兴趣小组”提出的问题是:如图1,若点P与点A重合,过点E作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cfffc4b756bd8b93304efc27c3d7b41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946c16d99496d31ce4d87301a4793393.png)
拓展探究:
(2)“智慧小组”提出的问题是:如图2,当点P为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
问题解决:
(3)“创新小组”在前两个小组的启发下,提出的问题是:如图3,当点E恰好落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030ad41e1b0e30227aca204054dbc5fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.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1,
中,
,D是
上一点,
,以点C为圆心,
长为半径画弧,以点B为圆心,
长为半径画弧,两弧在
下方相交于点E,连接
与
相交于点F.
;
(2)求
的度数:
(3)如图2,若
,求AF的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e12457d5b7d0f2611f4cdc173ceb784.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d31265af56a5dccb9f997e4023bc52db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1420735ea5f7363a2a137942ff89df33.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e2a22b69f20fe74f4459dd1e4890da.png)
您最近一年使用:0次