名校
1 . 如图,在正方形
中,
,E是射线
上的一点,连接
,过点E作
,交直线
于点F,以
为邻边作矩形
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/c90d1275-598a-4df5-a49a-13e637304d8a.png?resizew=313)
(1)求证:矩形
是正方形;
(2)如图1,当E点在对角线
上时,求
的值;
(3)当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3f58c56ea4208b11b56a343ea1de26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833ee84968e2c903b6350c23943b4fe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/c90d1275-598a-4df5-a49a-13e637304d8a.png?resizew=313)
(1)求证:矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
(2)如图1,当E点在对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c17d5b76e2dbaaa6e295f0d5dad969b.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3acee288e75061ac72203b09fce29904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次
2024-04-06更新
|
300次组卷
|
4卷引用:江苏省泰州市姜堰区姜堰区第四中学2023-2024学年七年级下学期3月月考数学试题
2 . 在锐角三角形
中,
是
边上的高,分别以
、
为一边,向外作正方形
和
,连接
、
和
,
与
的延长线交于点M,下列结论:①
;②
;③
;④
是
的中线,其中结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7a0bfc593a8a33b6cade6ba213904c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/184921a45f87423e92cf1e627ad55143.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb29dc024f8f554eaa879bac345aeb92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0972f8dc1e2a5720ea7bc57dfd9018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0e7f42d19527c8d3a6e3a45040f3aeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00870385ca7f3214e2971779eb4c7904.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/4/b9802a88-9803-4ebc-a397-23087cf3bb66.png?resizew=221)
A.①②③ | B.①②④ | C.②③④ | D.①②③④ |
您最近一年使用:0次
3 . 如图,已知正方形
中,
,它的两边分别交线段
于点M、N,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/544a86fb81355546422c8ab64cd21981.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f9585a33dae93dcff606ee6dfce44f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/251e73db45980dec1e3db36cd52b6e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c426b2dcf71b27c98e6e2b2276a6230.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/544a86fb81355546422c8ab64cd21981.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/21/56b04af6-4818-4057-b11b-6b8232253ab6.png?resizew=159)
您最近一年使用:0次
名校
4 . 如图,四边形
、
均为正方形,且B、C、E三点在同一直线上,G在线段
上,M为
上一点,
,
与
交于点N,连接
、
、
.下列结论:①
;②
;③
的周长
;④
平分
,其中正确结论的个数是( )
![](https://img.xkw.com/dksih/QBM/2021/8/27/2795072448094208/2795099769274368/STEM/6289bfa8-f4eb-4b1d-9727-9b72970ec267.png?resizew=230)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9af41df8bea61eb18594f326277b118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4593976c5c7623e893a9c2353b539c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03e9337b954a1d6bcd5dc07062eb1b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe8f12845beff3a9bf05c9a20660334.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4067b50a6aa2a6462f1d9df4b093f66.png)
![](https://img.xkw.com/dksih/QBM/2021/8/27/2795072448094208/2795099769274368/STEM/6289bfa8-f4eb-4b1d-9727-9b72970ec267.png?resizew=230)
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次
名校
解题方法
5 . 数学课上,王老师出示了问题:如图1,四边形ABCD是正方形,点E是边BC 的中点,AEF90 ,且EF交正方形外角DCG的平分线CF于点F,求证: AE =EF.
(1)经过思考,淘气展示了一种正确的解题思路:在AB上截取BM=BE,连接ME,则AM =EC,易证△ECF≌△AME,所以AE= EF淘气证三角形全等所用的判定是 .
在此基础上,同学们作了进一步的研究:
(2)奇思提出:如图 2,如果把“点 E 是边 BC 的中点”改为“点 E 是边 BC 上(除 B ,C 外)的任意一点”, 其它条件不变,那么结论“ AE= EF”仍然成立,你认为奇思的观点正确吗?如果正确,写出证明过程; 如果不正确,请说明理由;
(3)小华提出:如图 3,点 E 是 BC 的延长线上(除C 点外)的任意一点,其他条件不变,结论“ AE= EF ” 仍然成立.你认为小华的观点正确吗?如果正确,写出证明过程;如果不正确,请说明理由.
(1)经过思考,淘气展示了一种正确的解题思路:在AB上截取BM=BE,连接ME,则AM =EC,易证△ECF≌△AME,所以AE= EF淘气证三角形全等所用的判定是 .
在此基础上,同学们作了进一步的研究:
(2)奇思提出:如图 2,如果把“点 E 是边 BC 的中点”改为“点 E 是边 BC 上(除 B ,C 外)的任意一点”, 其它条件不变,那么结论“ AE= EF”仍然成立,你认为奇思的观点正确吗?如果正确,写出证明过程; 如果不正确,请说明理由;
(3)小华提出:如图 3,点 E 是 BC 的延长线上(除C 点外)的任意一点,其他条件不变,结论“ AE= EF ” 仍然成立.你认为小华的观点正确吗?如果正确,写出证明过程;如果不正确,请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/11/29/2603300263190528/2610328108990464/STEM/d1b1cc5f-8642-46be-8f44-69d52e820a65.png?resizew=536)
您最近一年使用:0次
6 . 如图,正方形ABCD的边长是3cm,一个边长为1cm的小正方形沿着正方形ABCD的边AB→BC→CD→DA→AB连续地翻转,那么这个小正方形第一次回到起始位置时,小正方形中小箭头的方向是向________ (填写:上、下、左、右).
![](https://img.xkw.com/dksih/QBM/2016/1/22/1573960869650432/1573960876023808/STEM/ba8f71deb23b48dfa1fa3359ffd404b5.png?resizew=89)
您最近一年使用:0次
7 . 如图,四边形ABCD与四边形CEFH均为正方形,点B、C、E在同一直线上,连接BD,DF,BF.
![](https://img.xkw.com/dksih/QBM/2015/1/20/1573788077301760/1573788083650560/STEM/3911efdd415544888aeab7ddec31b693.png)
(1)观察图形,直接写出与线段CH平行的线段 .
(2)图中与线段CH垂直的线段共有_______条.
(3)点B到点F的最短距离为线段____的长,点B到线段EF的的最短距离为线段____的长.
(4)若正方形ABCD的边长为a, 正方形CEFH的边长为2,则线段HD=___,线段BE=___,
此时请你求出三角形DBF的面积,你有什么发现?
![](https://img.xkw.com/dksih/QBM/2015/1/20/1573788077301760/1573788083650560/STEM/3911efdd415544888aeab7ddec31b693.png)
(1)观察图形,直接写出与线段CH平行的线段 .
(2)图中与线段CH垂直的线段共有_______条.
(3)点B到点F的最短距离为线段____的长,点B到线段EF的的最短距离为线段____的长.
(4)若正方形ABCD的边长为a, 正方形CEFH的边长为2,则线段HD=___,线段BE=___,
此时请你求出三角形DBF的面积,你有什么发现?
您最近一年使用:0次
解答题-证明题
|
适中(0.65)
|
8 . 如图1,已知正方形
,把一个直角与正方形叠合,使直角顶点与一重合,当直角的一边与
相交于E点,另一边与
的延长线相交于F点时.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/57c4f0d8-0bc4-46f1-93b3-5aa3f8d983b2.jpg?resizew=433)
(1)证明:
;
(2)如图2,作
的平分线交
于G点,连接
.证明:
;
(3)如图3,将图1中的“直角”改为“
”,当
的一边与
的延长线相交于E点,另一边与
的延长线相交于F点,连接
.线段
,
和
之间有怎样的数量关系?并加以证明.
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/57c4f0d8-0bc4-46f1-93b3-5aa3f8d983b2.jpg?resizew=433)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
(2)如图2,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fdc587c3766098bf3be2879d0f2703a.png)
(3)如图3,将图1中的“直角”改为“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
您最近一年使用:0次
2016-12-05更新
|
1944次组卷
|
3卷引用:2013-2014学年江苏省苏州市相城区七年级下学期期末考试数学试卷
10-11九年级下·北京昌平·阶段练习
9 . 如图,点E、D分别是正三角形ABC、正四边形ABCM、正五边形ABCMN中以C点为顶点的一边延长线和另一边反向延长线上的点,且BE=CD,DB的延长线交AE于点F,则图1中∠AFB的度数为______ ;若将条件“正三角形、正四边形、正五边形”改为“正n边形”,其他条件不变,则∠AFB的度数为__________ .(用n的代数式表示,其中,
≥3,且
为整数)
![](https://img.xkw.com/dksih/QBM/2011/7/6/1573221205778432/1573221287239680/STEM/80d3d8fb9ce346c3a40c4dd8da9e223b.png?resizew=175)
![](https://img.xkw.com/dksih/QBM/2011/7/6/1573221205778432/1573221287239680/STEM/970ca189ea8148708b4fc463489cc4a9.png?resizew=150)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://img.xkw.com/dksih/QBM/2011/7/6/1573221205778432/1573221287239680/STEM/80d3d8fb9ce346c3a40c4dd8da9e223b.png?resizew=175)
![](https://img.xkw.com/dksih/QBM/2011/7/6/1573221205778432/1573221287239680/STEM/970ca189ea8148708b4fc463489cc4a9.png?resizew=150)
![](https://img.xkw.com/dksih/QBM/2011/7/6/1573221205778432/1573221287239680/STEM/b8535bf383d3440b8cb8e1e39bd91e24.png?resizew=143)
您最近一年使用:0次