综合与实践:
a.背景阅读:
宽与长的比是
(约为0.618)的矩形叫黄金矩形.黄金矩形给我们以协调、匀称的美感世界各国许多著名的建筑,为取得最佳的视觉效果,都采用黄金矩形的设计,如希腊的巴特农神庙等.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/31/7ba1a975-79db-434d-9b81-227e595bb647.png?resizew=478)
b.实践操作:
下面我们折叠出一个黄金矩形(如图所示):
第一步:在一张宽为2的矩形纸片的一端,利用如图①所示的方法折叠出一个正方形
,然后把纸片展平;
第二步:如图②,把这个正方形折成两个相等的矩形
和
,再把纸片展平;
第三步:折出矩形
的对角线
,并沿
折叠纸片,使点
落在
延长线上的点
处,如图③所示;
第四步:展平纸片,过点
折出
,使
和
垂直,得到矩形
,如图④,矩形
就是黄金矩形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/31/ad5aadd5-bf60-48bc-8342-516ca5a2db34.png?resizew=382)
c.问题解决:
(1)图③中,
______(保留根号),四边形
的形状是______;
(2)请证明图④中的四边形
是黄金矩形;
(3)请在图④中再找出一个黄金矩形,这个黄金矩形是______(黄金矩形
除外,直接写出答案,不需证明,参考数值
)
a.背景阅读:
宽与长的比是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029d393bb07b7140905b85f550519de4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/31/7ba1a975-79db-434d-9b81-227e595bb647.png?resizew=478)
b.实践操作:
下面我们折叠出一个黄金矩形(如图所示):
第一步:在一张宽为2的矩形纸片的一端,利用如图①所示的方法折叠出一个正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9238757804254960bc40fa9d87065559.png)
第二步:如图②,把这个正方形折成两个相等的矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46b4ffe041a35a5cc95ad0536b366887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f586e0ac7e6b48947fe4d031df382df.png)
第三步:折出矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f586e0ac7e6b48947fe4d031df382df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
第四步:展平纸片,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c42bce098904b241986bb91c65ab33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c42bce098904b241986bb91c65ab33.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/31/ad5aadd5-bf60-48bc-8342-516ca5a2db34.png?resizew=382)
c.问题解决:
(1)图③中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82c8a8d50ff378dc485a3df77f7f273.png)
(2)请证明图④中的四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
(3)请在图④中再找出一个黄金矩形,这个黄金矩形是______(黄金矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/840ea6bc07b112930a367fa5dab8ad30.png)
更新时间:2022-07-28 12:25:16
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【推荐1】已知将一矩形纸片ABCD折叠,使顶点A与C重合,折痕为EF.
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【推荐2】已知,矩形
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971b23e3ee827018557d6c88edd5369a.png)
![](https://img.xkw.com/dksih/QBM/2019/4/2/2173840081518592/null/STEM/c39bc33d870d43b6a9a373da07d4f43a.png?resizew=101)
![](https://img.xkw.com/dksih/QBM/2019/4/2/2173840081518592/null/STEM/4dcd4ab871ee4933ab6841c7105ba702.png?resizew=161)
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【推荐1】长沙为打造宜游环境,对某旅游道路进行改造.如图是风景秀美的观景山,从山脚B到山腰D沿斜坡已建成步行道,为方便游客登顶观景,欲从D到A修建电动扶梯,经测量,山高
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(1)求
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(2)求电动扶梯DA的长(结果保留根号).
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a43f4fd3b4d424837eadd40e6e05d0.png)
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【推荐2】如图,▱ABCD中,点E在BC延长线上,EC=BC,连接DE,AC,AC⊥AD于点A、
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【推荐1】如图,在△ABC中,点D是BC边的中点,点E,F分别在AC,AB上,且DE∥AB,EF∥BC.
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【推荐2】如图,在四边形
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
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,
=
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上截取
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,
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,若
是
的中点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/f3c8c3a6-1312-4895-8dd7-8c1d97362f46.png?resizew=187)
求证:
(1)四边形
是菱形;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e1db385f16ebb7fa24bd8f1b36978b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0af2c07d1d8dae879d2729dc520a38b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffdf42abba6fad51987261cc8efd4044.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/f3c8c3a6-1312-4895-8dd7-8c1d97362f46.png?resizew=187)
求证:
(1)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd52e0a6db2c4d6749fb5947994b1f8.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/142cb9e1cb3ba952db28678589616ac4.png)
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