如图,四边形
中,
,E是对角线
的中点,连接
、
,点F在线段
上,且
平分
.
![](https://img.xkw.com/dksih/QBM/2022/10/16/3089019936079872/3095567588073472/STEM/31be39879e5f4258b9de621d4605af71.png?resizew=170)
(1)判断
的形状,并说明理由;
(2)求证:
垂直平分
;
(3)当
________时,
是等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3798a74058ec4bc40b6d9b5d268c359b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deeed7746a63b495d6117d7ba7f89e45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
![](https://img.xkw.com/dksih/QBM/2022/10/16/3089019936079872/3095567588073472/STEM/31be39879e5f4258b9de621d4605af71.png?resizew=170)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aa547d12c3dab4b3899ed1a80e10d3d.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0c46783b77cce2bd4b45b9acc61884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aa547d12c3dab4b3899ed1a80e10d3d.png)
更新时间:2022-10-25 23:31:17
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】已知
是等腰三角形,过
的一个顶点的一条直线,把
分成两个小三角形,如果这两个小三角形也是等腰三角形,我们把这样的等腰三角形叫做和谐三角形.请构造出所有符合条件的和谐三角形并标出相关角的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.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,在
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/493b8741-2482-46a2-9aae-ea994b3cc350.png?resizew=154)
(1)求
的度数;
(2)过点Q作
,交AP的延长线于点B,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c2c7f1c79f3b125bc95dc74a9dfca72.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/493b8741-2482-46a2-9aae-ea994b3cc350.png?resizew=154)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32986401a4d24904d5e446fa9210ac6.png)
(2)过点Q作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f35a7b005ce1340b09b2657fb96532a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30c7f410bd884aa4ea313e0f73c5877a.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,在平行四边形
中,连接
,点
为
的中点,延长
与
的延长线交于点
,连接
,若
,求证:四边形
是矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/512df8170ee55dba52f9252e53265022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b0b077bfd3700e78db35bea761ae29.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,
为
的直径,
、
为
的弦,延长
、
交于点C,且
,过点B作
的切线交
的延长线于点F.
![](https://img.xkw.com/dksih/QBM/2020/2/6/2393321677643776/2393350146072576/STEM/e74dacf3f406403cb2b36ddd5ec12f0f.png?resizew=114)
(1)求证:
;
(2)若
,
,求
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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2020/2/6/2393321677643776/2393350146072576/STEM/e74dacf3f406403cb2b36ddd5ec12f0f.png?resizew=114)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a702c324e0c76150540c3d32df802077.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d64e0206b1814c35cc96bd2b6b12239a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93bc4c9dd737193f7acce692b23500d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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,在△ABC和△EDF中,AC=EF,∠ACB=∠F=90°,点A,D,B,E在同一条直线上,且点D,B分别为AB,DE中点.
(1)求证:△ABC≌△EDF.
(2)连接CD,当CD=5,EF=6时,求BC的长.
(1)求证:△ABC≌△EDF.
(2)连接CD,当CD=5,EF=6时,求BC的长.
![](https://img.xkw.com/dksih/QBM/2021/5/6/2714983078641664/2715970723446784/STEM/51b456be12554011821681a2367fe69e.png?resizew=173)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知:如图,四边形
中,
,垂足分别为E、F,
.
为菱形;
(2)联结
交
于点O,联结
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/741ffd199ed2382ab05bceb881341fcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)联结
![](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/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea89498e8ad9db0d612bf7f2da48fa33.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】根据项目素材,探索解决问题.
项目主题 | 如何剪出直角三角形的完美线? |
项目背景 | 新课标(2022版)要求学校教育要坚持“立德树人”,实施“跨学科学习、项目式学习”.在学习完特殊的平行四边形后,某校组织了该次项目式学习. |
项目素材 | 在直角三角形中,过直角顶点剪一刀,剪痕将直角分成两个锐角,若这两个锐角分别等于此直角三角形中的另外两个内角,则称这条剪痕为直角三角形的“完美线”. |
问题解决 | |
项目一 操作 | 如图,有一张直角三角形纸片,![]() ![]() ![]()
|
项目二 探究 | 如图,在直角三角形纸片中,![]() ![]() ![]() ![]()
|
项目三 拓展 | 在![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
您最近一年使用:0次