我们定义:有一组邻边相等的凸四边形叫做“等邻边四边形”.
![](https://img.xkw.com/dksih/QBM/2021/7/1/2754959098830848/2761118316478464/STEM/5f3afe23-b0a3-479a-9197-c2d43ad6c7a6.png?resizew=472)
(1)如图1,四边形
的顶点
,
,
在网格格点上,请你在
的网格中分别画出
个不同形状的等邻边四边形
,要求顶点
在网格格点上.
(2)如图2,
,
,
平分
,求证:四边形
为“等邻边四边形”.
(3)如图3,在(2)的条件下,
,
,
是
的中点,点
是
边上一点,当四边形
是“等邻边四边形”时,求
的长.
![](https://img.xkw.com/dksih/QBM/2021/7/1/2754959098830848/2761118316478464/STEM/5f3afe23-b0a3-479a-9197-c2d43ad6c7a6.png?resizew=472)
(1)如图1,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd557c3ac7908fe535f678a50361b820.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0e5697eca3f5205cb7b343648240bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)如图3,在(2)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715e8d47a14154fe05be45b4f3f4f2bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
更新时间:2021-07-10 10:52:30
|
相似题推荐
解答题-作图题
|
适中
(0.65)
【推荐1】如图,在
中,
,
是高,
是
的外角
的平分线.
(1)用尺规作图方法,作
的平分线
保留作图痕迹,不写作法和证明);
(2)设
与
交于点
,判断
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3eb092d5f9440ede1be6e96594ff8d5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/5/5ddc3371-aa10-453f-96c8-57c7ba714496.png?resizew=151)
(1)用尺规作图方法,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa783be67f9c5bb06c08796ce22f82c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d3f1e6b0d27ba1ff98f8bbd34b60040.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/967e9a89e4b6db4bdd7108d5f7af625d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ca13a715cae753737d1be851c132b49.png)
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,在△ABC中,AD是高,CE是AB边上的中线,且DC=BE.求证:∠B=2∠BCE.
![](https://img.xkw.com/dksih/QBM/2020/1/2/2368432881631232/2369133113294850/STEM/d851e541c73e4cf5b31015fc78845343.png?resizew=141)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】如图1,已知等腰直角三角形的直角边长与正方形
的边长均为
与
在同一条直线上,开始时点
与点
重合,固定正方形
不动,将
沿射线
平移,平移的速度为
,设运动时间为
,等腰直角三角形
和正方形
的重叠部分面积为
.
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cbeede118c407a800b05757b9a1393e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070d1ea22a92808dad7489438c239629.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56bb615b68fdd6edfe77c246e81702a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070d1ea22a92808dad7489438c239629.png)
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】“玩转数学”实践活动,是一种非常有效的学习方式,我们一起来动手、动脑玩转数学吧.如图①,折一折:将正方形纸片
折叠,使边
,
都落在对角线
上,展开得折痕
,
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/bf72f30a-d15c-4780-8c16-0825605789ed.jpg?resizew=270)
(1)
_______°;
转一转:如图②,将图①中的
绕点A旋转,使它的两边分别交边
,
于点P,Q,连接
.
(2)猜想线段
、
、
之间的数量关系,并说明理由;
(3)若正方形的边长为6,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/bf72f30a-d15c-4780-8c16-0825605789ed.jpg?resizew=270)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e569f82eb96d237501ed0fba536e9ac4.png)
转一转:如图②,将图①中的
![](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/7a5f1641947153c80b987320885a2b57.png)
(2)猜想线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
(3)若正方形的边长为6,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b7ddeaf0a0ed481573cb15a7c79a6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】(本题10分)背景知识:宽 与长 的比等于
(约为0.618)的矩形称为黄金矩形.黄金矩形给我们以协调、匀称的美感.世界上很多著名建筑,为了取得最佳的视觉效果,都采用了黄金矩形的设计,如希腊帕特农神庙等.
实验操作:折一个黄金矩形
第一步,在矩形纸片的一端利用图1的方法折出一个正方形
,然后把纸片展平;
第二步:如图2,将正方形折成两个相等的矩形,再将其展平;
第三步:折出内侧矩形的对角线
,并将
折到图3所示的
处;
第四步,展平纸片,按照所得的点
折出
,矩形
就是黄金矩形(如图4).
问题思考:
(2)图4中是否还存在其它黄金矩形,请判断并说明理由;
(3)以图3中的折痕
为边,构造黄金矩形,若
,则这个矩形的面积是______(直接写出结果).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029d393bb07b7140905b85f550519de4.png)
实验操作:折一个黄金矩形
第一步,在矩形纸片的一端利用图1的方法折出一个正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9238757804254960bc40fa9d87065559.png)
第二步:如图2,将正方形折成两个相等的矩形,再将其展平;
第三步:折出内侧矩形的对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
第四步,展平纸片,按照所得的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cf2fa3cb87267ee5f968c2a9362d216.png)
问题思考:
(2)图4中是否还存在其它黄金矩形,请判断并说明理由;
(3)以图3中的折痕
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e5c289b8aabdbfba95c7fd1e1842f4.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,矩形
中,对角线
与
相交于点
交
的延长线于点E.
![](https://img.xkw.com/dksih/QBM/2021/4/30/2710808133394432/2710926298087424/STEM/562750ebb78d48fb8d30daa2825ffb85.png?resizew=236)
(1)求证:
;
(2)若AD=4,cos∠ADB=
,求
的长.
![](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/5f48e33103a89d1740cde66a658f85a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2021/4/30/2710808133394432/2710926298087424/STEM/562750ebb78d48fb8d30daa2825ffb85.png?resizew=236)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b54b2d216a66a9cc6bc4348f3cec50c.png)
(2)若AD=4,cos∠ADB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
名校
【推荐2】如图,四边形
是矩形,连接
、
交于点
,
平分
交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/e82837db-372e-48bf-a1ee-641920fc0de9.png?resizew=218)
(1)用尺规完成基本作图:作
的角平分线交
于点
,连接
,
;(保留作图痕迹,不写作法,不写结论)
(2)猜想四边形
是哪种特殊四边形,并完成下列证明.
解:
四边形
是矩形,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd30c3ac4a2a89c5ba6ca481dfc8ad5c.png)
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd30c3ac4a2a89c5ba6ca481dfc8ad5c.png)
______
______.①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d651925fac6518b4ad340d38d46527.png)
平分
,
平分
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd30c3ac4a2a89c5ba6ca481dfc8ad5c.png)
,
.
______.②
在
和
中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/552abc18fb31b3151ea82bba17290be7.png)
______.③
______.④
又![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d651925fac6518b4ad340d38d46527.png)
,
四边形
是______.⑤
![](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/701f3b0e2bedfe5195443459072d798e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f46e16a737e586f4e4f48bb1d6a60399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252053b853152bd294a8315debd00b92.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/e82837db-372e-48bf-a1ee-641920fc0de9.png?resizew=218)
(1)用尺规完成基本作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d807fd20a6aaf0b27594d1d151d4a673.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655b6a742dbacdab5aaa298007663dd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
(2)猜想四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d651925fac6518b4ad340d38d46527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd30c3ac4a2a89c5ba6ca481dfc8ad5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44934b866a5d58b423bca8e6a2e814c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd30c3ac4a2a89c5ba6ca481dfc8ad5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a564c17839410a6f6a209195b027daf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7abf5534bafbb85cc81fa60cc620fa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d651925fac6518b4ad340d38d46527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f46e16a737e586f4e4f48bb1d6a60399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60c9c331b8f287d061b98785833be318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd30c3ac4a2a89c5ba6ca481dfc8ad5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7275d2ebd9559ccfe24621409aaafc13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba998c76134d395eccdd206d9a3aaf66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd30c3ac4a2a89c5ba6ca481dfc8ad5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d651925fac6518b4ad340d38d46527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb3960862432c8a904b27441550976c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4097938515adbab7991fa2e118d5d03b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/552abc18fb31b3151ea82bba17290be7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd30c3ac4a2a89c5ba6ca481dfc8ad5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd30c3ac4a2a89c5ba6ca481dfc8ad5c.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d651925fac6518b4ad340d38d46527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf4560c76478c2cd0482c9f32d562e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd30c3ac4a2a89c5ba6ca481dfc8ad5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
您最近一年使用:0次